diff --git a/hw/net/opencores_eth.c b/hw/net/opencores_eth.c
index 6abeffcc9c..a25f8eccff 100644
--- a/hw/net/opencores_eth.c
+++ b/hw/net/opencores_eth.c
@@ -683,6 +683,15 @@ static void open_eth_reg_write(void *opaque,
     }
 }
 
+static const MemoryRegionOps open_eth_reg_ops = {
+    .read = open_eth_reg_read,
+    .write = open_eth_reg_write,
+    .impl = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
 static uint64_t open_eth_desc_read(void *opaque,
         hwaddr addr, unsigned int size)
 {
@@ -706,12 +715,6 @@ static void open_eth_desc_write(void *opaque,
     open_eth_check_start_xmit(s);
 }
 
-
-static const MemoryRegionOps open_eth_reg_ops = {
-    .read = open_eth_reg_read,
-    .write = open_eth_reg_write,
-};
-
 static const MemoryRegionOps open_eth_desc_ops = {
     .read = open_eth_desc_read,
     .write = open_eth_desc_write,