diff --git a/netfilterqueue.c b/netfilterqueue.c
index 744c733..b52ab2f 100644
--- a/netfilterqueue.c
+++ b/netfilterqueue.c
@@ -529,7 +529,7 @@ enum  {
   __pyx_e_14netfilterqueue_IPPROTO_MAX
 };
 
-/* "netfilterqueue.pxd":135
+/* "netfilterqueue.pxd":136
  * 
  * # Dummy defines from linux/socket.h:
  * cdef enum: #  Protocol families, same as address families.             # <<<<<<<<<<<<<<
@@ -541,7 +541,7 @@ enum  {
   __pyx_e_14netfilterqueue_PF_INET6 = 10
 };
 
-/* "netfilterqueue.pxd":143
+/* "netfilterqueue.pxd":144
  * 
  * # Dummy defines from linux/netfilter.h
  * cdef enum:             # <<<<<<<<<<<<<<
@@ -550,7 +550,7 @@ enum  {
  */
 enum  {
 
-  /* "netfilterqueue.pxd":150
+  /* "netfilterqueue.pxd":151
  *     NF_REPEAT
  *     NF_STOP
  *     NF_MAX_VERDICT = NF_STOP             # <<<<<<<<<<<<<<
@@ -566,7 +566,7 @@ enum  {
   __pyx_e_14netfilterqueue_NF_MAX_VERDICT = __pyx_e_14netfilterqueue_NF_STOP
 };
 
-/* "netfilterqueue.pxd":152
+/* "netfilterqueue.pxd":153
  *     NF_MAX_VERDICT = NF_STOP
  * 
  * cdef class Packet:             # <<<<<<<<<<<<<<
@@ -593,7 +593,7 @@ struct __pyx_obj_14netfilterqueue_Packet {
 };
 
 
-/* "netfilterqueue.pxd":191
+/* "netfilterqueue.pxd":192
  *     cpdef repeat(self)
  * 
  * cdef class NetfilterQueue:             # <<<<<<<<<<<<<<
@@ -611,7 +611,7 @@ struct __pyx_obj_14netfilterqueue_NetfilterQueue {
 
 
 
-/* "netfilterqueue.pyx":34
+/* "netfilterqueue.pyx":36
  *     return 1
  * 
  * cdef class Packet:             # <<<<<<<<<<<<<<
@@ -869,6 +869,10 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_accept(struct __pyx_obj_14netf
 static PyObject *__pyx_f_14netfilterqueue_6Packet_drop(struct __pyx_obj_14netfilterqueue_Packet *__pyx_v_self, int __pyx_skip_dispatch); /* proto*/
 static PyObject *__pyx_f_14netfilterqueue_6Packet_repeat(struct __pyx_obj_14netfilterqueue_Packet *__pyx_v_self, int __pyx_skip_dispatch); /* proto*/
 
+/* Module declarations from 'cpython.version' */
+
+/* Module declarations from 'cpython' */
+
 /* Module declarations from 'netfilterqueue' */
 static PyTypeObject *__pyx_ptype_14netfilterqueue_Packet = 0;
 static PyTypeObject *__pyx_ptype_14netfilterqueue_NetfilterQueue = 0;
@@ -1052,7 +1056,7 @@ static const char __pyx_k_any_host_internal_protocol[] = "any host internal prot
 static const char __pyx_k_any_distributed_file_system[] = "any distributed file system";
 static const char __pyx_k_any_private_encryption_scheme[] = "any private encryption scheme";
 static const char __pyx_k_Failed_to_set_packet_copy_mode[] = "Failed to set packet copy mode.";
-static const char __pyx_k_Bind_to_a_Linux_netfilter_queue[] = "\nBind to a Linux netfilter queue. Send packets to a user-specified callback \nfunction.\n\nCopyright: (c) 2011, Kerkhoff Technologies Inc.\nLicense: MIT; see LICENSE.txt\n";
+static const char __pyx_k_Bind_to_a_Linux_netfilter_queue[] = "\nBind to a Linux netfilter queue. Send packets to a user-specified callback\nfunction.\n\nCopyright: (c) 2011, Kerkhoff Technologies Inc.\nLicense: MIT; see LICENSE.txt\n";
 static const char __pyx_k_Failed_to_bind_family_s_Are_you[] = "Failed to bind family %s. Are you root?";
 static const char __pyx_k_Failed_to_get_payload_of_packet[] = "Failed to get payload of packet.";
 static const char __pyx_k_Verdict_already_given_for_this_p[] = "Verdict already given for this packet.";
@@ -1406,8 +1410,8 @@ static PyObject *__pyx_tuple__3;
 static PyObject *__pyx_tuple__6;
 static PyObject *__pyx_tuple__7;
 
-/* "netfilterqueue.pyx":23
- * DEF MaxCopySize = BufferSize - MetadataSize
+/* "netfilterqueue.pyx":25
+ * cimport cpython.version
  * 
  * cdef int global_callback(nfq_q_handle *qh, nfgenmsg *nfmsg,             # <<<<<<<<<<<<<<
  *                          nfq_data *nfa, void *data) with gil:
@@ -1429,7 +1433,7 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   #endif
   __Pyx_RefNannySetupContext("global_callback", 0);
 
-  /* "netfilterqueue.pyx":26
+  /* "netfilterqueue.pyx":28
  *                          nfq_data *nfa, void *data) with gil:
  *     """Create a Packet and pass it to appropriate callback."""
  *     cdef NetfilterQueue nfqueue = <NetfilterQueue>data             # <<<<<<<<<<<<<<
@@ -1441,7 +1445,7 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   __pyx_v_nfqueue = ((struct __pyx_obj_14netfilterqueue_NetfilterQueue *)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":27
+  /* "netfilterqueue.pyx":29
  *     """Create a Packet and pass it to appropriate callback."""
  *     cdef NetfilterQueue nfqueue = <NetfilterQueue>data
  *     cdef object user_callback = <object>nfqueue.user_callback             # <<<<<<<<<<<<<<
@@ -1453,30 +1457,30 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   __pyx_v_user_callback = __pyx_t_1;
   __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":29
+  /* "netfilterqueue.pyx":31
  *     cdef object user_callback = <object>nfqueue.user_callback
  * 
  *     packet = Packet()             # <<<<<<<<<<<<<<
  *     packet.set_nfq_data(qh, nfa)
  *     user_callback(packet)
  */
-  __pyx_t_1 = __Pyx_PyObject_Call(((PyObject *)__pyx_ptype_14netfilterqueue_Packet), __pyx_empty_tuple, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 29, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyObject_Call(((PyObject *)__pyx_ptype_14netfilterqueue_Packet), __pyx_empty_tuple, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 31, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_packet = ((struct __pyx_obj_14netfilterqueue_Packet *)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":30
+  /* "netfilterqueue.pyx":32
  * 
  *     packet = Packet()
  *     packet.set_nfq_data(qh, nfa)             # <<<<<<<<<<<<<<
  *     user_callback(packet)
  *     return 1
  */
-  __pyx_t_1 = ((struct __pyx_vtabstruct_14netfilterqueue_Packet *)__pyx_v_packet->__pyx_vtab)->set_nfq_data(__pyx_v_packet, __pyx_v_qh, __pyx_v_nfa); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 30, __pyx_L1_error)
+  __pyx_t_1 = ((struct __pyx_vtabstruct_14netfilterqueue_Packet *)__pyx_v_packet->__pyx_vtab)->set_nfq_data(__pyx_v_packet, __pyx_v_qh, __pyx_v_nfa); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 32, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":31
+  /* "netfilterqueue.pyx":33
  *     packet = Packet()
  *     packet.set_nfq_data(qh, nfa)
  *     user_callback(packet)             # <<<<<<<<<<<<<<
@@ -1495,23 +1499,23 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
     }
   }
   if (!__pyx_t_3) {
-    __pyx_t_1 = __Pyx_PyObject_CallOneArg(__pyx_t_2, ((PyObject *)__pyx_v_packet)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 31, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyObject_CallOneArg(__pyx_t_2, ((PyObject *)__pyx_v_packet)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 33, __pyx_L1_error)
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   } else {
-    __pyx_t_4 = PyTuple_New(1+1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 31, __pyx_L1_error)
+    __pyx_t_4 = PyTuple_New(1+1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 33, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_4);
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     __Pyx_INCREF(((PyObject *)__pyx_v_packet));
     __Pyx_GIVEREF(((PyObject *)__pyx_v_packet));
     PyTuple_SET_ITEM(__pyx_t_4, 0+1, ((PyObject *)__pyx_v_packet));
-    __pyx_t_1 = __Pyx_PyObject_Call(__pyx_t_2, __pyx_t_4, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 31, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyObject_Call(__pyx_t_2, __pyx_t_4, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 33, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
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   __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":32
+  /* "netfilterqueue.pyx":34
  *     packet.set_nfq_data(qh, nfa)
  *     user_callback(packet)
  *     return 1             # <<<<<<<<<<<<<<
@@ -1521,8 +1525,8 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   __pyx_r = 1;
   goto __pyx_L0;
 
-  /* "netfilterqueue.pyx":23
- * DEF MaxCopySize = BufferSize - MetadataSize
+  /* "netfilterqueue.pyx":25
+ * cimport cpython.version
  * 
  * cdef int global_callback(nfq_q_handle *qh, nfgenmsg *nfmsg,             # <<<<<<<<<<<<<<
  *                          nfq_data *nfa, void *data) with gil:
@@ -1548,7 +1552,7 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":36
+/* "netfilterqueue.pyx":38
  * cdef class Packet:
  *     """A packet received from NetfilterQueue."""
  *     def __cinit__(self):             # <<<<<<<<<<<<<<
@@ -1577,7 +1581,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
   __Pyx_RefNannyDeclarations
   __Pyx_RefNannySetupContext("__cinit__", 0);
 
-  /* "netfilterqueue.pyx":37
+  /* "netfilterqueue.pyx":39
  *     """A packet received from NetfilterQueue."""
  *     def __cinit__(self):
  *         self._verdict_is_set = False             # <<<<<<<<<<<<<<
@@ -1586,7 +1590,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
  */
   __pyx_v_self->_verdict_is_set = 0;
 
-  /* "netfilterqueue.pyx":38
+  /* "netfilterqueue.pyx":40
  *     def __cinit__(self):
  *         self._verdict_is_set = False
  *         self._mark_is_set = False             # <<<<<<<<<<<<<<
@@ -1595,7 +1599,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
  */
   __pyx_v_self->_mark_is_set = 0;
 
-  /* "netfilterqueue.pyx":39
+  /* "netfilterqueue.pyx":41
  *         self._verdict_is_set = False
  *         self._mark_is_set = False
  *         self._given_payload = None             # <<<<<<<<<<<<<<
@@ -1608,7 +1612,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
   __Pyx_DECREF(__pyx_v_self->_given_payload);
   __pyx_v_self->_given_payload = ((PyObject*)Py_None);
 
-  /* "netfilterqueue.pyx":36
+  /* "netfilterqueue.pyx":38
  * cdef class Packet:
  *     """A packet received from NetfilterQueue."""
  *     def __cinit__(self):             # <<<<<<<<<<<<<<
@@ -1622,7 +1626,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":41
+/* "netfilterqueue.pyx":43
  *         self._given_payload = None
  * 
  *     def __str__(self):             # <<<<<<<<<<<<<<
@@ -1656,7 +1660,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
   PyObject *__pyx_t_6 = NULL;
   __Pyx_RefNannySetupContext("__str__", 0);
 
-  /* "netfilterqueue.pyx":42
+  /* "netfilterqueue.pyx":44
  * 
  *     def __str__(self):
  *         cdef iphdr *hdr = <iphdr*>self.payload             # <<<<<<<<<<<<<<
@@ -1665,19 +1669,19 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
  */
   __pyx_v_hdr = ((struct iphdr *)__pyx_v_self->payload);
 
-  /* "netfilterqueue.pyx":43
+  /* "netfilterqueue.pyx":45
  *     def __str__(self):
  *         cdef iphdr *hdr = <iphdr*>self.payload
  *         protocol = PROTOCOLS.get(hdr.protocol, "Unknown protocol")             # <<<<<<<<<<<<<<
  *         return "%s packet, %s bytes" % (protocol, self.payload_len)
  * 
  */
-  __pyx_t_2 = __Pyx_GetModuleGlobalName(__pyx_n_s_PROTOCOLS); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 43, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_GetModuleGlobalName(__pyx_n_s_PROTOCOLS); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 45, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_2);
-  __pyx_t_3 = __Pyx_PyObject_GetAttrStr(__pyx_t_2, __pyx_n_s_get); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 43, __pyx_L1_error)
+  __pyx_t_3 = __Pyx_PyObject_GetAttrStr(__pyx_t_2, __pyx_n_s_get); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 45, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_3);
   __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-  __pyx_t_2 = __Pyx_PyInt_From_u_int8_t(__pyx_v_hdr->protocol); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 43, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_PyInt_From_u_int8_t(__pyx_v_hdr->protocol); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 45, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_2);
   __pyx_t_4 = NULL;
   __pyx_t_5 = 0;
@@ -1691,7 +1695,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
       __pyx_t_5 = 1;
     }
   }
-  __pyx_t_6 = PyTuple_New(2+__pyx_t_5); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 43, __pyx_L1_error)
+  __pyx_t_6 = PyTuple_New(2+__pyx_t_5); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 45, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_6);
   if (__pyx_t_4) {
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@@ -1702,14 +1706,14 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
   __Pyx_GIVEREF(__pyx_kp_s_Unknown_protocol);
   PyTuple_SET_ITEM(__pyx_t_6, 1+__pyx_t_5, __pyx_kp_s_Unknown_protocol);
   __pyx_t_2 = 0;
-  __pyx_t_1 = __Pyx_PyObject_Call(__pyx_t_3, __pyx_t_6, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 43, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyObject_Call(__pyx_t_3, __pyx_t_6, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 45, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __Pyx_DECREF(__pyx_t_6); __pyx_t_6 = 0;
   __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
   __pyx_v_protocol = __pyx_t_1;
   __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":44
+  /* "netfilterqueue.pyx":46
  *         cdef iphdr *hdr = <iphdr*>self.payload
  *         protocol = PROTOCOLS.get(hdr.protocol, "Unknown protocol")
  *         return "%s packet, %s bytes" % (protocol, self.payload_len)             # <<<<<<<<<<<<<<
@@ -1717,9 +1721,9 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
  *     cdef set_nfq_data(self, nfq_q_handle *qh, nfq_data *nfa):
  */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = PyInt_FromSsize_t(__pyx_v_self->payload_len); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 44, __pyx_L1_error)
+  __pyx_t_1 = PyInt_FromSsize_t(__pyx_v_self->payload_len); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 46, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
-  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 44, __pyx_L1_error)
+  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 46, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_3);
   __Pyx_INCREF(__pyx_v_protocol);
   __Pyx_GIVEREF(__pyx_v_protocol);
@@ -1727,14 +1731,14 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
   __Pyx_GIVEREF(__pyx_t_1);
   PyTuple_SET_ITEM(__pyx_t_3, 1, __pyx_t_1);
   __pyx_t_1 = 0;
-  __pyx_t_1 = __Pyx_PyString_Format(__pyx_kp_s_s_packet_s_bytes, __pyx_t_3); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 44, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyString_Format(__pyx_kp_s_s_packet_s_bytes, __pyx_t_3); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 46, __pyx_L1_error)
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   __pyx_r = __pyx_t_1;
   __pyx_t_1 = 0;
   goto __pyx_L0;
 
-  /* "netfilterqueue.pyx":41
+  /* "netfilterqueue.pyx":43
  *         self._given_payload = None
  * 
  *     def __str__(self):             # <<<<<<<<<<<<<<
@@ -1758,7 +1762,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":46
+/* "netfilterqueue.pyx":48
  *         return "%s packet, %s bytes" % (protocol, self.payload_len)
  * 
  *     cdef set_nfq_data(self, nfq_q_handle *qh, nfq_data *nfa):             # <<<<<<<<<<<<<<
@@ -1774,7 +1778,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
   PyObject *__pyx_t_3 = NULL;
   __Pyx_RefNannySetupContext("set_nfq_data", 0);
 
-  /* "netfilterqueue.pyx":51
+  /* "netfilterqueue.pyx":53
  *         local values.
  *         """
  *         self._qh = qh             # <<<<<<<<<<<<<<
@@ -1783,7 +1787,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->_qh = __pyx_v_qh;
 
-  /* "netfilterqueue.pyx":52
+  /* "netfilterqueue.pyx":54
  *         """
  *         self._qh = qh
  *         self._nfa = nfa             # <<<<<<<<<<<<<<
@@ -1792,7 +1796,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->_nfa = __pyx_v_nfa;
 
-  /* "netfilterqueue.pyx":53
+  /* "netfilterqueue.pyx":55
  *         self._qh = qh
  *         self._nfa = nfa
  *         self._hdr = nfq_get_msg_packet_hdr(nfa)             # <<<<<<<<<<<<<<
@@ -1801,7 +1805,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->_hdr = nfq_get_msg_packet_hdr(__pyx_v_nfa);
 
-  /* "netfilterqueue.pyx":55
+  /* "netfilterqueue.pyx":57
  *         self._hdr = nfq_get_msg_packet_hdr(nfa)
  * 
  *         self.id = ntohl(self._hdr.packet_id)             # <<<<<<<<<<<<<<
@@ -1810,7 +1814,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->id = ntohl(__pyx_v_self->_hdr->packet_id);
 
-  /* "netfilterqueue.pyx":56
+  /* "netfilterqueue.pyx":58
  * 
  *         self.id = ntohl(self._hdr.packet_id)
  *         self.hw_protocol = ntohs(self._hdr.hw_protocol)             # <<<<<<<<<<<<<<
@@ -1819,7 +1823,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->hw_protocol = ntohs(__pyx_v_self->_hdr->hw_protocol);
 
-  /* "netfilterqueue.pyx":57
+  /* "netfilterqueue.pyx":59
  *         self.id = ntohl(self._hdr.packet_id)
  *         self.hw_protocol = ntohs(self._hdr.hw_protocol)
  *         self.hook = self._hdr.hook             # <<<<<<<<<<<<<<
@@ -1829,7 +1833,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
   __pyx_t_1 = __pyx_v_self->_hdr->hook;
   __pyx_v_self->hook = __pyx_t_1;
 
-  /* "netfilterqueue.pyx":59
+  /* "netfilterqueue.pyx":61
  *         self.hook = self._hdr.hook
  * 
  *         self.payload_len = nfq_get_payload(self._nfa, &self.payload)             # <<<<<<<<<<<<<<
@@ -1838,7 +1842,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->payload_len = nfq_get_payload(__pyx_v_self->_nfa, (&__pyx_v_self->payload));
 
-  /* "netfilterqueue.pyx":60
+  /* "netfilterqueue.pyx":62
  * 
  *         self.payload_len = nfq_get_payload(self._nfa, &self.payload)
  *         if self.payload_len < 0:             # <<<<<<<<<<<<<<
@@ -1848,20 +1852,20 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
   __pyx_t_2 = ((__pyx_v_self->payload_len < 0) != 0);
   if (__pyx_t_2) {
 
-    /* "netfilterqueue.pyx":61
+    /* "netfilterqueue.pyx":63
  *         self.payload_len = nfq_get_payload(self._nfa, &self.payload)
  *         if self.payload_len < 0:
  *             raise OSError("Failed to get payload of packet.")             # <<<<<<<<<<<<<<
  * 
  *         nfq_get_timestamp(self._nfa, &self.timestamp)
  */
-    __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_OSError, __pyx_tuple_, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 61, __pyx_L1_error)
+    __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_OSError, __pyx_tuple_, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 63, __pyx_L1_error)
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-    __PYX_ERR(0, 61, __pyx_L1_error)
+    __PYX_ERR(0, 63, __pyx_L1_error)
 
-    /* "netfilterqueue.pyx":60
+    /* "netfilterqueue.pyx":62
  * 
  *         self.payload_len = nfq_get_payload(self._nfa, &self.payload)
  *         if self.payload_len < 0:             # <<<<<<<<<<<<<<
@@ -1870,7 +1874,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   }
 
-  /* "netfilterqueue.pyx":63
+  /* "netfilterqueue.pyx":65
  *             raise OSError("Failed to get payload of packet.")
  * 
  *         nfq_get_timestamp(self._nfa, &self.timestamp)             # <<<<<<<<<<<<<<
@@ -1879,7 +1883,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   nfq_get_timestamp(__pyx_v_self->_nfa, (&__pyx_v_self->timestamp));
 
-  /* "netfilterqueue.pyx":64
+  /* "netfilterqueue.pyx":66
  * 
  *         nfq_get_timestamp(self._nfa, &self.timestamp)
  *         self.mark = nfq_get_nfmark(nfa)             # <<<<<<<<<<<<<<
@@ -1888,7 +1892,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->mark = nfq_get_nfmark(__pyx_v_nfa);
 
-  /* "netfilterqueue.pyx":46
+  /* "netfilterqueue.pyx":48
  *         return "%s packet, %s bytes" % (protocol, self.payload_len)
  * 
  *     cdef set_nfq_data(self, nfq_q_handle *qh, nfq_data *nfa):             # <<<<<<<<<<<<<<
@@ -1909,7 +1913,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":66
+/* "netfilterqueue.pyx":68
  *         self.mark = nfq_get_nfmark(nfa)
  * 
  *     cdef void verdict(self, u_int8_t verdict):             # <<<<<<<<<<<<<<
@@ -1927,7 +1931,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   unsigned char *__pyx_t_4;
   __Pyx_RefNannySetupContext("verdict", 0);
 
-  /* "netfilterqueue.pyx":68
+  /* "netfilterqueue.pyx":70
  *     cdef void verdict(self, u_int8_t verdict):
  *         """Call appropriate set_verdict... function on packet."""
  *         if self._verdict_is_set:             # <<<<<<<<<<<<<<
@@ -1937,20 +1941,20 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   __pyx_t_1 = (__pyx_v_self->_verdict_is_set != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":69
+    /* "netfilterqueue.pyx":71
  *         """Call appropriate set_verdict... function on packet."""
  *         if self._verdict_is_set:
  *             raise RuntimeWarning("Verdict already given for this packet.")             # <<<<<<<<<<<<<<
  * 
  *         cdef u_int32_t modified_payload_len = 0
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-    __pyx_t_2 = __Pyx_PyObject_Call(__pyx_builtin_RuntimeWarning, __pyx_tuple__2, NULL); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 69, __pyx_L1_error)
+    __pyx_t_2 = __Pyx_PyObject_Call(__pyx_builtin_RuntimeWarning, __pyx_tuple__2, NULL); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 71, __pyx_L1_error)
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-    __PYX_ERR(0, 69, __pyx_L1_error)
+    __PYX_ERR(0, 71, __pyx_L1_error)
 
-    /* "netfilterqueue.pyx":68
+    /* "netfilterqueue.pyx":70
  *     cdef void verdict(self, u_int8_t verdict):
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  *         if self._verdict_is_set:             # <<<<<<<<<<<<<<
@@ -1959,7 +1963,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   }
 
-  /* "netfilterqueue.pyx":71
+  /* "netfilterqueue.pyx":73
  *             raise RuntimeWarning("Verdict already given for this packet.")
  * 
  *         cdef u_int32_t modified_payload_len = 0             # <<<<<<<<<<<<<<
@@ -1968,7 +1972,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   __pyx_v_modified_payload_len = 0;
 
-  /* "netfilterqueue.pyx":72
+  /* "netfilterqueue.pyx":74
  * 
  *         cdef u_int32_t modified_payload_len = 0
  *         cdef unsigned char *modified_payload = NULL             # <<<<<<<<<<<<<<
@@ -1977,7 +1981,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   __pyx_v_modified_payload = NULL;
 
-  /* "netfilterqueue.pyx":73
+  /* "netfilterqueue.pyx":75
  *         cdef u_int32_t modified_payload_len = 0
  *         cdef unsigned char *modified_payload = NULL
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@@ -1987,7 +1991,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   __pyx_t_1 = (__pyx_v_self->_given_payload != Py_None) && (PyBytes_GET_SIZE(__pyx_v_self->_given_payload) != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":74
+    /* "netfilterqueue.pyx":76
  *         cdef unsigned char *modified_payload = NULL
  *         if self._given_payload:
  *             modified_payload_len = len(self._given_payload)             # <<<<<<<<<<<<<<
@@ -1998,23 +2002,23 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
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-    __pyx_t_3 = PyBytes_GET_SIZE(__pyx_t_2); if (unlikely(__pyx_t_3 == -1)) __PYX_ERR(0, 74, __pyx_L1_error)
+    __pyx_t_3 = PyBytes_GET_SIZE(__pyx_t_2); if (unlikely(__pyx_t_3 == -1)) __PYX_ERR(0, 76, __pyx_L1_error)
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     __pyx_v_modified_payload_len = __pyx_t_3;
 
-    /* "netfilterqueue.pyx":75
+    /* "netfilterqueue.pyx":77
  *         if self._given_payload:
  *             modified_payload_len = len(self._given_payload)
  *             modified_payload = self._given_payload             # <<<<<<<<<<<<<<
  *         if self._mark_is_set:
  *             nfq_set_verdict_mark(
  */
-    __pyx_t_4 = __Pyx_PyObject_AsUString(__pyx_v_self->_given_payload); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 75, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_AsUString(__pyx_v_self->_given_payload); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 77, __pyx_L1_error)
     __pyx_v_modified_payload = __pyx_t_4;
 
-    /* "netfilterqueue.pyx":73
+    /* "netfilterqueue.pyx":75
  *         cdef u_int32_t modified_payload_len = 0
  *         cdef unsigned char *modified_payload = NULL
  *         if self._given_payload:             # <<<<<<<<<<<<<<
@@ -2023,7 +2027,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   }
 
-  /* "netfilterqueue.pyx":76
+  /* "netfilterqueue.pyx":78
  *             modified_payload_len = len(self._given_payload)
  *             modified_payload = self._given_payload
  *         if self._mark_is_set:             # <<<<<<<<<<<<<<
@@ -2033,7 +2037,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   __pyx_t_1 = (__pyx_v_self->_mark_is_set != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":77
+    /* "netfilterqueue.pyx":79
  *             modified_payload = self._given_payload
  *         if self._mark_is_set:
  *             nfq_set_verdict_mark(             # <<<<<<<<<<<<<<
@@ -2042,7 +2046,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
     nfq_set_verdict_mark(__pyx_v_self->_qh, __pyx_v_self->id, __pyx_v_verdict, htonl(__pyx_v_self->_given_mark), __pyx_v_modified_payload_len, __pyx_v_modified_payload);
 
-    /* "netfilterqueue.pyx":76
+    /* "netfilterqueue.pyx":78
  *             modified_payload_len = len(self._given_payload)
  *             modified_payload = self._given_payload
  *         if self._mark_is_set:             # <<<<<<<<<<<<<<
@@ -2052,7 +2056,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
     goto __pyx_L5;
   }
 
-  /* "netfilterqueue.pyx":85
+  /* "netfilterqueue.pyx":87
  *                 modified_payload)
  *         else:
  *             nfq_set_verdict(             # <<<<<<<<<<<<<<
@@ -2061,7 +2065,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   /*else*/ {
 
-    /* "netfilterqueue.pyx":90
+    /* "netfilterqueue.pyx":92
  *                 verdict,
  *                 modified_payload_len,
  *                 modified_payload)             # <<<<<<<<<<<<<<
@@ -2072,7 +2076,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   }
   __pyx_L5:;
 
-  /* "netfilterqueue.pyx":92
+  /* "netfilterqueue.pyx":94
  *                 modified_payload)
  * 
  *         self._verdict_is_set = True             # <<<<<<<<<<<<<<
@@ -2081,7 +2085,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   __pyx_v_self->_verdict_is_set = 1;
 
-  /* "netfilterqueue.pyx":66
+  /* "netfilterqueue.pyx":68
  *         self.mark = nfq_get_nfmark(nfa)
  * 
  *     cdef void verdict(self, u_int8_t verdict):             # <<<<<<<<<<<<<<
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   __Pyx_RefNannyFinishContext();
 }
 
-/* "netfilterqueue.pyx":94
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  *         self._verdict_is_set = True
  * 
  *     def get_payload(self):             # <<<<<<<<<<<<<<
  *         """Return payload as Python string."""
- *         cdef object py_string = PyString_FromStringAndSize(self.payload,
+ *         cdef object py_string
  */
 
 /* Python wrapper */
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   PyObject *__pyx_v_py_string = 0;
   PyObject *__pyx_r = NULL;
   __Pyx_RefNannyDeclarations
-  PyObject *__pyx_t_1 = NULL;
+  int __pyx_t_1;
+  PyObject *__pyx_t_2 = NULL;
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-  /* "netfilterqueue.pyx":96
- *     def get_payload(self):
+  /* "netfilterqueue.pyx":99
  *         """Return payload as Python string."""
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- *                                                            self.payload_len)
+ *         cdef object py_string
+ *         if cpython.version.PY_MAJOR_VERSION >= 3:             # <<<<<<<<<<<<<<
+ *             py_string = PyBytes_FromStringAndSize(
+ *                 self.payload, self.payload_len)
+ */
+  __pyx_t_1 = ((PY_MAJOR_VERSION >= 3) != 0);
+  if (__pyx_t_1) {
+
+    /* "netfilterqueue.pyx":100
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+ *         if cpython.version.PY_MAJOR_VERSION >= 3:
+ *             py_string = PyBytes_FromStringAndSize(             # <<<<<<<<<<<<<<
+ *                 self.payload, self.payload_len)
+ *         else:
+ */
+    __pyx_t_2 = PyBytes_FromStringAndSize(__pyx_v_self->payload, __pyx_v_self->payload_len); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 100, __pyx_L1_error)
+    __Pyx_GOTREF(__pyx_t_2);
+    __pyx_v_py_string = __pyx_t_2;
+    __pyx_t_2 = 0;
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+    /* "netfilterqueue.pyx":99
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+ *         cdef object py_string
+ *         if cpython.version.PY_MAJOR_VERSION >= 3:             # <<<<<<<<<<<<<<
+ *             py_string = PyBytes_FromStringAndSize(
+ *                 self.payload, self.payload_len)
+ */
+    goto __pyx_L3;
+  }
+
+  /* "netfilterqueue.pyx":103
+ *                 self.payload, self.payload_len)
+ *         else:
+ *             py_string = PyString_FromStringAndSize(             # <<<<<<<<<<<<<<
+ *                 self.payload, self.payload_len)
  *         return py_string
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-  __pyx_t_1 = PyString_FromStringAndSize(__pyx_v_self->payload, __pyx_v_self->payload_len); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 96, __pyx_L1_error)
-  __Pyx_GOTREF(__pyx_t_1);
-  __pyx_v_py_string = __pyx_t_1;
-  __pyx_t_1 = 0;
+  /*else*/ {
 
-  /* "netfilterqueue.pyx":98
- *         cdef object py_string = PyString_FromStringAndSize(self.payload,
- *                                                            self.payload_len)
+    /* "netfilterqueue.pyx":104
+ *         else:
+ *             py_string = PyString_FromStringAndSize(
+ *                 self.payload, self.payload_len)             # <<<<<<<<<<<<<<
+ *         return py_string
+ * 
+ */
+    __pyx_t_2 = PyString_FromStringAndSize(__pyx_v_self->payload, __pyx_v_self->payload_len); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 103, __pyx_L1_error)
+    __Pyx_GOTREF(__pyx_t_2);
+    __pyx_v_py_string = __pyx_t_2;
+    __pyx_t_2 = 0;
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+  __pyx_L3:;
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+  /* "netfilterqueue.pyx":105
+ *             py_string = PyString_FromStringAndSize(
+ *                 self.payload, self.payload_len)
  *         return py_string             # <<<<<<<<<<<<<<
  * 
  *     cpdef Py_ssize_t get_payload_len(self):
@@ -2151,17 +2199,17 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4get_payload(struct __pyx_obj
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   goto __pyx_L0;
 
-  /* "netfilterqueue.pyx":94
+  /* "netfilterqueue.pyx":96
  *         self._verdict_is_set = True
  * 
  *     def get_payload(self):             # <<<<<<<<<<<<<<
  *         """Return payload as Python string."""
- *         cdef object py_string = PyString_FromStringAndSize(self.payload,
+ *         cdef object py_string
  */
 
   /* function exit code */
   __pyx_L1_error:;
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+  __Pyx_XDECREF(__pyx_t_2);
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 }
 
-/* "netfilterqueue.pyx":100
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  *     cpdef Py_ssize_t get_payload_len(self):             # <<<<<<<<<<<<<<
@@ -2193,7 +2241,7 @@ static Py_ssize_t __pyx_f_14netfilterqueue_6Packet_get_payload_len(struct __pyx_
   if (unlikely(__pyx_skip_dispatch)) ;
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   else if (unlikely(Py_TYPE(((PyObject *)__pyx_v_self))->tp_dictoffset != 0)) {
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+    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_get_payload_len); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 107, __pyx_L1_error)
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@@ -2208,14 +2256,14 @@ static Py_ssize_t __pyx_f_14netfilterqueue_6Packet_get_payload_len(struct __pyx_
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-        __pyx_t_2 = __Pyx_PyObject_CallNoArg(__pyx_t_3); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 100, __pyx_L1_error)
+        __pyx_t_2 = __Pyx_PyObject_CallNoArg(__pyx_t_3); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 107, __pyx_L1_error)
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+      __pyx_t_5 = __Pyx_PyIndex_AsSsize_t(__pyx_t_2); if (unlikely((__pyx_t_5 == (Py_ssize_t)-1) && PyErr_Occurred())) __PYX_ERR(0, 107, __pyx_L1_error)
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@@ -2224,7 +2272,7 @@ static Py_ssize_t __pyx_f_14netfilterqueue_6Packet_get_payload_len(struct __pyx_
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-  /* "netfilterqueue.pyx":101
+  /* "netfilterqueue.pyx":108
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  *     cpdef Py_ssize_t get_payload_len(self):
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   goto __pyx_L0;
 
-  /* "netfilterqueue.pyx":100
+  /* "netfilterqueue.pyx":107
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  *     cpdef Py_ssize_t get_payload_len(self):             # <<<<<<<<<<<<<<
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-  __pyx_t_1 = PyInt_FromSsize_t(__pyx_f_14netfilterqueue_6Packet_get_payload_len(__pyx_v_self, 1)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 100, __pyx_L1_error)
+  __pyx_t_1 = PyInt_FromSsize_t(__pyx_f_14netfilterqueue_6Packet_get_payload_len(__pyx_v_self, 1)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 107, __pyx_L1_error)
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@@ -2291,7 +2339,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_6get_payload_len(struct __pyx
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":103
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  *     cpdef double get_timestamp(self):             # <<<<<<<<<<<<<<
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@@ -4028,7 +4076,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx
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   __pyx_v_self->qh = NULL;
 
-  /* "netfilterqueue.pyx":169
+  /* "netfilterqueue.pyx":176
  *         nfq_set_queue_maxlen(self.qh, max_len)
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@@ -4043,7 +4091,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":176
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       #endif
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-        /* "netfilterqueue.pyx":182
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-      /* "netfilterqueue.pyx":181
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-  /* "netfilterqueue.pyx":183
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-    /* "netfilterqueue.pyx":184
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         #endif
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-          /* "netfilterqueue.pyx":186
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-        /* "netfilterqueue.pyx":185
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-  /* "netfilterqueue.pyx":176
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-  /* "netfilterqueue.pyx":61
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  *         if self.payload_len < 0:
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  * 
  *         nfq_get_timestamp(self._nfa, &self.timestamp)
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-  /* "netfilterqueue.pyx":69
+  /* "netfilterqueue.pyx":71
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  * 
  *         cdef u_int32_t modified_payload_len = 0
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-  /* "netfilterqueue.pyx":138
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-  /* "netfilterqueue.pyx":165
+  /* "netfilterqueue.pyx":172
  *             range = MaxCopySize
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@@ -4981,14 +5029,14 @@ PyMODINIT_FUNC PyInit_netfilterqueue(void)
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   __pyx_vtable_14netfilterqueue_Packet.repeat = (PyObject *(*)(struct __pyx_obj_14netfilterqueue_Packet *, int __pyx_skip_dispatch))__pyx_f_14netfilterqueue_6Packet_repeat;
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@@ -5043,20 +5091,20 @@ PyMODINIT_FUNC PyInit_netfilterqueue(void)
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  */
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   /* "netfilterqueue.pyx":1
diff --git a/netfilterqueue.pxd b/netfilterqueue.pxd
index 4e0f831..cacd38b 100644
--- a/netfilterqueue.pxd
+++ b/netfilterqueue.pxd
@@ -47,6 +47,7 @@ cdef enum:
     IPPROTO_MAX
 
 cdef extern from "Python.h":
+    object PyBytes_FromStringAndSize(char *s, Py_ssize_t len)
     object PyString_FromStringAndSize(char *s, Py_ssize_t len)
 
 cdef extern from "sys/time.h":
@@ -78,7 +79,7 @@ cdef extern from "libnetfilter_queue/linux_nfnetlink_queue.h":
         u_int32_t packet_id
         u_int16_t hw_protocol
         u_int8_t hook
-        
+
 cdef extern from "libnetfilter_queue/libnetfilter_queue.h":
     struct nfq_handle:
         pass
@@ -88,10 +89,10 @@ cdef extern from "libnetfilter_queue/libnetfilter_queue.h":
         pass
     struct nfqnl_msg_packet_hw:
         u_int8_t hw_addr[8]
-    
+
     nfq_handle *nfq_open()
     int nfq_close(nfq_handle *h)
-    
+
     int nfq_bind_pf(nfq_handle *h, u_int16_t pf)
     int nfq_unbind_pf(nfq_handle *h, u_int16_t pf)
     ctypedef int *nfq_callback(nfq_q_handle *gh, nfgenmsg *nfmsg,
@@ -101,21 +102,21 @@ cdef extern from "libnetfilter_queue/libnetfilter_queue.h":
                                     nfq_callback *cb,
                                     void *data)
     int nfq_destroy_queue(nfq_q_handle *qh)
-    
+
     int nfq_handle_packet(nfq_handle *h, char *buf, int len)
-    
+
     int nfq_set_mode(nfq_q_handle *qh,
                        u_int8_t mode, unsigned int len)
-    
+
     q_set_queue_maxlen(nfq_q_handle *qh,
                      u_int32_t queuelen)
-    
+
     int nfq_set_verdict(nfq_q_handle *qh,
                           u_int32_t id,
                           u_int32_t verdict,
                           u_int32_t data_len,
                           unsigned char *buf) nogil
-    
+
     int nfq_set_verdict_mark(nfq_q_handle *qh,
                             u_int32_t id,
                             u_int32_t verdict,
@@ -130,7 +131,7 @@ cdef extern from "libnetfilter_queue/libnetfilter_queue.h":
     int nfq_get_timestamp(nfq_data *nfad, timeval *tv)
     nfqnl_msg_packet_hw *nfq_get_packet_hw(nfq_data *nfad)
     int nfq_get_nfmark (nfq_data *nfad)
-    
+
 # Dummy defines from linux/socket.h:
 cdef enum: #  Protocol families, same as address families.
     PF_INET = 2
@@ -138,7 +139,7 @@ cdef enum: #  Protocol families, same as address families.
 
 cdef extern from "sys/socket.h":
     ssize_t recv(int __fd, void *__buf, size_t __n, int __flags) nogil
-    
+
 # Dummy defines from linux/netfilter.h
 cdef enum:
     NF_DROP
@@ -153,18 +154,18 @@ cdef class Packet:
     cdef nfq_q_handle *_qh
     cdef nfq_data *_nfa
     cdef nfqnl_msg_packet_hdr *_hdr
-    cdef bint _verdict_is_set # True if verdict has been issued, 
+    cdef bint _verdict_is_set # True if verdict has been issued,
         # false otherwise
     cdef bint _mark_is_set # True if a mark has been given, false otherwise
     cdef u_int32_t _given_mark # Mark given to packet
     cdef bytes _given_payload # New payload of packet, or null
-    
+
     # From NFQ packet header:
     cdef readonly u_int32_t id
     cdef readonly u_int16_t hw_protocol
     cdef readonly u_int8_t hook
     cdef readonly u_int32_t mark
-    
+
     # Packet details:
     cdef Py_ssize_t payload_len
     cdef readonly char *payload
@@ -176,7 +177,7 @@ cdef class Packet:
     #cdef readonly u_int32_t physindev
     #cdef readonly u_int32_t outdev
     #cdef readonly u_int32_t physoutdev
-    
+
     cdef set_nfq_data(self, nfq_q_handle *qh, nfq_data *nfa)
     cdef void verdict(self, u_int8_t verdict)
     cpdef Py_ssize_t get_payload_len(self)
@@ -187,11 +188,11 @@ cdef class Packet:
     cpdef accept(self)
     cpdef drop(self)
     cpdef repeat(self)
-    
+
 cdef class NetfilterQueue:
     cdef object user_callback # User callback
     cdef nfq_handle *h # Handle to NFQueue library
     cdef nfq_q_handle *qh # A handle to the queue
     cdef u_int16_t af # Address family
     cdef packet_copy_size # Amount of packet metadata + data copied to buffer
-    
+
diff --git a/netfilterqueue.pyx b/netfilterqueue.pyx
index 756654a..abc2c80 100644
--- a/netfilterqueue.pyx
+++ b/netfilterqueue.pyx
@@ -1,5 +1,5 @@
 """
-Bind to a Linux netfilter queue. Send packets to a user-specified callback 
+Bind to a Linux netfilter queue. Send packets to a user-specified callback
 function.
 
 Copyright: (c) 2011, Kerkhoff Technologies Inc.
@@ -20,7 +20,9 @@ DEF BufferSize = 4096
 DEF MetadataSize = 80
 DEF MaxCopySize = BufferSize - MetadataSize
 
-cdef int global_callback(nfq_q_handle *qh, nfgenmsg *nfmsg, 
+cimport cpython.version
+
+cdef int global_callback(nfq_q_handle *qh, nfgenmsg *nfmsg,
                          nfq_data *nfa, void *data) with gil:
     """Create a Packet and pass it to appropriate callback."""
     cdef NetfilterQueue nfqueue = <NetfilterQueue>data
@@ -37,29 +39,29 @@ cdef class Packet:
         self._verdict_is_set = False
         self._mark_is_set = False
         self._given_payload = None
-    
+
     def __str__(self):
         cdef iphdr *hdr = <iphdr*>self.payload
         protocol = PROTOCOLS.get(hdr.protocol, "Unknown protocol")
         return "%s packet, %s bytes" % (protocol, self.payload_len)
-    
+
     cdef set_nfq_data(self, nfq_q_handle *qh, nfq_data *nfa):
         """
-        Assign a packet from NFQ to this object. Parse the header and load 
+        Assign a packet from NFQ to this object. Parse the header and load
         local values.
         """
         self._qh = qh
         self._nfa = nfa
         self._hdr = nfq_get_msg_packet_hdr(nfa)
-        
+
         self.id = ntohl(self._hdr.packet_id)
         self.hw_protocol = ntohs(self._hdr.hw_protocol)
         self.hook = self._hdr.hook
-        
+
         self.payload_len = nfq_get_payload(self._nfa, &self.payload)
         if self.payload_len < 0:
             raise OSError("Failed to get payload of packet.")
-        
+
         nfq_get_timestamp(self._nfa, &self.timestamp)
         self.mark = nfq_get_nfmark(nfa)
 
@@ -69,7 +71,7 @@ cdef class Packet:
             raise RuntimeWarning("Verdict already given for this packet.")
 
         cdef u_int32_t modified_payload_len = 0
-        cdef unsigned char *modified_payload = NULL        
+        cdef unsigned char *modified_payload = NULL
         if self._given_payload:
             modified_payload_len = len(self._given_payload)
             modified_payload = self._given_payload
@@ -90,23 +92,28 @@ cdef class Packet:
                 modified_payload)
 
         self._verdict_is_set = True
-    
+
     def get_payload(self):
         """Return payload as Python string."""
-        cdef object py_string = PyString_FromStringAndSize(self.payload,
-                                                           self.payload_len)
+        cdef object py_string
+        if cpython.version.PY_MAJOR_VERSION >= 3:
+            py_string = PyBytes_FromStringAndSize(
+                self.payload, self.payload_len)
+        else:
+            py_string = PyString_FromStringAndSize(
+                self.payload, self.payload_len)
         return py_string
-    
+
     cpdef Py_ssize_t get_payload_len(self):
         return self.payload_len
-    
+
     cpdef double get_timestamp(self):
         return self.timestamp.tv_sec + (self.timestamp.tv_usec/1000000.0)
-    
+
     cpdef set_payload(self, bytes payload):
         """Set the new payload of this packet."""
         self._given_payload = payload
-        
+
     cpdef set_mark(self, u_int32_t mark):
         self._given_mark = mark
         self._mark_is_set = True
@@ -115,11 +122,11 @@ cdef class Packet:
         if self._mark_is_set:
             return self._given_mark
         return self.mark
-    
+
     cpdef accept(self):
         """Accept the packet."""
         self.verdict(NF_ACCEPT)
-        
+
     cpdef drop(self):
         """Drop the packet."""
         self.verdict(NF_DROP)
@@ -136,20 +143,20 @@ cdef class NetfilterQueue:
         self.h = nfq_open()
         if self.h == NULL:
             raise OSError("Failed to open NFQueue.")
-        nfq_unbind_pf(self.h, self.af) # This does NOT kick out previous 
+        nfq_unbind_pf(self.h, self.af) # This does NOT kick out previous
             # running queues
         if nfq_bind_pf(self.h, self.af) < 0:
             raise OSError("Failed to bind family %s. Are you root?" % self.af)
-    
+
     def __dealloc__(self):
         if self.qh != NULL:
             nfq_destroy_queue(self.qh)
-        # Don't call nfq_unbind_pf unless you want to disconnect any other 
+        # Don't call nfq_unbind_pf unless you want to disconnect any other
         # processes using this libnetfilter_queue on this protocol family!
         nfq_close(self.h)
 
     def bind(self, int queue_num, object user_callback,
-                u_int32_t max_len=DEFAULT_MAX_QUEUELEN, 
+                u_int32_t max_len=DEFAULT_MAX_QUEUELEN,
                 u_int8_t mode=NFQNL_COPY_PACKET,
                 u_int32_t range=MaxPacketSize):
         """Create and bind to a new queue."""
@@ -158,21 +165,21 @@ cdef class NetfilterQueue:
                                    <nfq_callback*>global_callback, <void*>self)
         if self.qh == NULL:
             raise OSError("Failed to create queue %s." % queue_num)
-        
+
         if range > MaxCopySize:
             range = MaxCopySize
         if nfq_set_mode(self.qh, mode, range) < 0:
             raise OSError("Failed to set packet copy mode.")
-        
+
         nfq_set_queue_maxlen(self.qh, max_len)
-    
+
     def unbind(self):
         """Destroy the queue."""
         if self.qh != NULL:
             nfq_destroy_queue(self.qh)
         self.qh = NULL
         # See warning about nfq_unbind_pf in __dealloc__ above.
-        
+
     def run(self):
         """Begin accepting packets."""
         cdef int fd = nfq_fd(self.h)
diff --git a/setup.py b/setup.py
index cab7d6b..0656291 100644
--- a/setup.py
+++ b/setup.py
@@ -42,5 +42,6 @@ setup(
         "Intended Audience :: Telecommunications Industry",
         "Programming Language :: Cython",
         "Programming Language :: Python :: 2",
+        "Programming Language :: Python :: 3",
     ]
 )