diff --git a/hw/misc/aspeed_scu.c b/hw/misc/aspeed_scu.c
index ec4fef900e..764222404b 100644
--- a/hw/misc/aspeed_scu.c
+++ b/hw/misc/aspeed_scu.c
@@ -328,9 +328,10 @@ static const MemoryRegionOps aspeed_ast2400_scu_ops = {
     .read = aspeed_scu_read,
     .write = aspeed_ast2400_scu_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
-    .valid.min_access_size = 4,
-    .valid.max_access_size = 4,
-    .valid.unaligned = false,
+    .valid = {
+        .min_access_size = 1,
+        .max_access_size = 4,
+    },
 };
 
 static const MemoryRegionOps aspeed_ast2500_scu_ops = {