diff --git a/hw/misc/mac_via.c b/hw/misc/mac_via.c
index 0a25de577c..8810eb97cc 100644
--- a/hw/misc/mac_via.c
+++ b/hw/misc/mac_via.c
@@ -966,7 +966,7 @@ static const MemoryRegionOps mos6522_q800_via1_ops = {
     .endianness = DEVICE_BIG_ENDIAN,
     .valid = {
         .min_access_size = 1,
-        .max_access_size = 1,
+        .max_access_size = 4,
     },
 };
 
@@ -995,7 +995,7 @@ static const MemoryRegionOps mos6522_q800_via2_ops = {
     .endianness = DEVICE_BIG_ENDIAN,
     .valid = {
         .min_access_size = 1,
-        .max_access_size = 1,
+        .max_access_size = 4,
     },
 };