diff --git a/contrib/plugins/lockstep.c b/contrib/plugins/lockstep.c
index f0cb8792c6..33654c5c60 100644
--- a/contrib/plugins/lockstep.c
+++ b/contrib/plugins/lockstep.c
@@ -33,6 +33,25 @@
 
 #include <qemu-plugin.h>
 
+static inline gpointer g_memdup2_qemu(gconstpointer mem, gsize byte_size)
+{
+#if GLIB_CHECK_VERSION(2, 68, 0)
+    return g_memdup2(mem, byte_size);
+#else
+    gpointer new_mem;
+
+    if (mem && byte_size != 0) {
+        new_mem = g_malloc(byte_size);
+        memcpy(new_mem, mem, byte_size);
+    } else {
+        new_mem = NULL;
+    }
+
+    return new_mem;
+#endif
+}
+#define g_memdup2(m, s) g_memdup2_qemu(m, s)
+
 QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
 
 /* saved so we can uninstall later */