diff --git a/src/tencent_sdk_trtc.h b/src/tencent_sdk_trtc.h
index e19b922..4e66ebf 100644
--- a/src/tencent_sdk_trtc.h
+++ b/src/tencent_sdk_trtc.h
@@ -43,6 +43,7 @@ namespace module
 	private:
 		virtual void regist_global(const char* name, sol::state* lua);
 		virtual void delete_global() { delete this; }
+		virtual void self_free() {}
 	};
 }