diff --git a/hw/sparc/sun4m_iommu.c b/hw/sparc/sun4m_iommu.c
index 8c1fc82534..5a4c1f5e3b 100644
--- a/hw/sparc/sun4m_iommu.c
+++ b/hw/sparc/sun4m_iommu.c
@@ -238,7 +238,7 @@ static void iommu_mem_write(void *opaque, hwaddr addr,
 static const MemoryRegionOps iommu_mem_ops = {
     .read = iommu_mem_read,
     .write = iommu_mem_write,
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness = DEVICE_BIG_ENDIAN,
     .valid = {
         .min_access_size = 4,
         .max_access_size = 4,
diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index 5778709b41..0980b44659 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -254,7 +254,7 @@ static void power_mem_write(void *opaque, hwaddr addr,
 static const MemoryRegionOps power_mem_ops = {
     .read = power_mem_read,
     .write = power_mem_write,
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness = DEVICE_BIG_ENDIAN,
     .valid = {
         .min_access_size = 4,
         .max_access_size = 4,