diff --git a/hw/misc/bcm2835_rng.c b/hw/misc/bcm2835_rng.c
index e4d2c224c8..4492e325b4 100644
--- a/hw/misc/bcm2835_rng.c
+++ b/hw/misc/bcm2835_rng.c
@@ -93,6 +93,10 @@ static const MemoryRegionOps bcm2835_rng_ops = {
     .read = bcm2835_rng_read,
     .write = bcm2835_rng_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl.min_access_size = 4,
+    .impl.max_access_size = 4,
+    .valid.min_access_size = 4,
+    .valid.max_access_size = 4,
 };
 
 static const VMStateDescription vmstate_bcm2835_rng = {