diff --git a/hw/display/artist.c b/hw/display/artist.c
index 46eaa10dae..44bb67bbc3 100644
--- a/hw/display/artist.c
+++ b/hw/display/artist.c
@@ -1237,20 +1237,16 @@ static const MemoryRegionOps artist_reg_ops = {
     .read = artist_reg_read,
     .write = artist_reg_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
-    .valid = {
-        .min_access_size = 1,
-        .max_access_size = 4,
-    },
+    .impl.min_access_size = 1,
+    .impl.max_access_size = 4,
 };
 
 static const MemoryRegionOps artist_vram_ops = {
     .read = artist_vram_read,
     .write = artist_vram_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
-    .valid = {
-        .min_access_size = 1,
-        .max_access_size = 4,
-    },
+    .impl.min_access_size = 1,
+    .impl.max_access_size = 4,
 };
 
 static void artist_draw_cursor(ARTISTState *s)