diff --git a/hw/intc/xilinx_intc.c b/hw/intc/xilinx_intc.c
index d99cf567ae..6930f83907 100644
--- a/hw/intc/xilinx_intc.c
+++ b/hw/intc/xilinx_intc.c
@@ -144,6 +144,10 @@ static const MemoryRegionOps pic_ops = {
     .read = pic_read,
     .write = pic_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
     .valid = {
         .min_access_size = 4,
         .max_access_size = 4
diff --git a/hw/net/xilinx_ethlite.c b/hw/net/xilinx_ethlite.c
index 4c0c7fcae3..88ab331acc 100644
--- a/hw/net/xilinx_ethlite.c
+++ b/hw/net/xilinx_ethlite.c
@@ -166,6 +166,10 @@ static const MemoryRegionOps eth_ops = {
     .read = eth_read,
     .write = eth_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
     .valid = {
         .min_access_size = 4,
         .max_access_size = 4
diff --git a/hw/timer/xilinx_timer.c b/hw/timer/xilinx_timer.c
index 4955fe1b01..6595cf5f51 100644
--- a/hw/timer/xilinx_timer.c
+++ b/hw/timer/xilinx_timer.c
@@ -193,6 +193,10 @@ static const MemoryRegionOps timer_ops = {
     .read = timer_read,
     .write = timer_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
     .valid = {
         .min_access_size = 4,
         .max_access_size = 4