diff --git a/src/object.c b/src/object.c
index 6866d805ca3064991086741644a1f128b110303a..dc3354f76d9576a0fab132eed7a24757f798af95 100644
--- a/src/object.c
+++ b/src/object.c
@@ -485,7 +485,7 @@ void rt_object_delete(rt_object_t object)
     RT_OBJECT_HOOK_CALL(rt_object_detach_hook, (object));
 
     /* reset object type */
-    object->type = 0;
+    object->type = RT_Object_Class_Null;
 
     /* lock interrupt */
     temp = rt_hw_interrupt_disable();