diff --git a/nasal_parse.h b/nasal_parse.h
index ecd4b65..6c5e0e2 100644
--- a/nasal_parse.h
+++ b/nasal_parse.h
@@ -946,6 +946,7 @@ nasal_ast nasal_parse::iter_gen()
         match(tok_id);
         while(is_call(tokens[ptr].type))
             node.add(call_scalar());
+        check_memory_reachable(node);
     }
     return node;
 }