diff --git a/id_table.c b/id_table.c
index 149f52cd88..b2ba6fae89 100644
--- a/id_table.c
+++ b/id_table.c
@@ -274,7 +274,7 @@ rb_id_table_foreach_with_replace(struct rb_id_table *tbl, rb_id_table_foreach_fu
 
     for (i=0; i<capa; i++) {
         if (ITEM_KEY_ISSET(tbl, i)) {
-            enum rb_id_table_iterator_result ret = (*func)(Qundef, tbl->items[i].val, data);
+            enum rb_id_table_iterator_result ret = (*func)((ID)0, tbl->items[i].val, data);
             assert(ITEM_GET_KEY(tbl, i));
 
             if (ret == ID_TABLE_REPLACE) {