diff --git a/lang/vm.c b/lang/vm.c
index 72b89fc..cf1ba6d 100644
--- a/lang/vm.c
+++ b/lang/vm.c
@@ -16,7 +16,7 @@
 	int stack_base;
 	int stack_next;
 	int stack_size;
-	Object *tail_obj;
+	Object tail_obj;
 	const char *tail_name;
 	StackTrace stack_trace;
 };