diff --git a/block/throttle-groups.c b/block/throttle-groups.c
index f5c0fac5814be07423233690764a35d402b6114a..d9e6228a73fde3b2317436a94f821202b7068b88 100644
--- a/block/throttle-groups.c
+++ b/block/throttle-groups.c
@@ -967,7 +967,7 @@ static const TypeInfo throttle_group_info = {
     .instance_size = sizeof(ThrottleGroup),
     .instance_init = throttle_group_obj_init,
     .instance_finalize = throttle_group_obj_finalize,
-    .interfaces = (InterfaceInfo[]) {
+    .interfaces = ((const InterfaceInfo[]) {
         { TYPE_USER_CREATABLE },
         { }
     },