diff --git a/qapi/qapi-dealloc-visitor.c b/qapi/qapi-dealloc-visitor.c
index a154523..a07b171 100644
--- a/qapi/qapi-dealloc-visitor.c
+++ b/qapi/qapi-dealloc-visitor.c
@@ -132,6 +132,11 @@
 {
 }
 
+static void qapi_dealloc_type_size(Visitor *v, size_t *obj, const char *name,
+                                   Error **errp)
+{
+}
+
 static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *strings[],
                                    const char *kind, const char *name,
                                    Error **errp)
@@ -164,6 +169,7 @@
     v->visitor.type_bool = qapi_dealloc_type_bool;
     v->visitor.type_str = qapi_dealloc_type_str;
     v->visitor.type_number = qapi_dealloc_type_number;
+    v->visitor.type_size = qapi_dealloc_type_size;
 
     QTAILQ_INIT(&v->stack);