diff --git a/hw/char/bcm2835_aux.c b/hw/char/bcm2835_aux.c
index ee3dd40e3c..dade2ab5fd 100644
--- a/hw/char/bcm2835_aux.c
+++ b/hw/char/bcm2835_aux.c
@@ -249,7 +249,9 @@ static const MemoryRegionOps bcm2835_aux_ops = {
     .read = bcm2835_aux_read,
     .write = bcm2835_aux_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
-    .valid.min_access_size = 4,
+    .impl.min_access_size = 4,
+    .impl.max_access_size = 4,
+    .valid.min_access_size = 1,
     .valid.max_access_size = 4,
 };