diff --git a/api/source/mk_thread.cpp b/api/source/mk_thread.cpp
index a28107a3..b73594e1 100644
--- a/api/source/mk_thread.cpp
+++ b/api/source/mk_thread.cpp
@@ -70,10 +70,10 @@ public:
 
     void start(int ms ,EventPoller &poller){
         weak_ptr<TimerForC> weak_self = shared_from_this();
-        poller.doDelayTask(ms, [weak_self](){
+        _task = poller.doDelayTask(ms, [weak_self]() {
             auto strong_self = weak_self.lock();
-            if(!strong_self){
-                return (uint64_t)0;
+            if (!strong_self) {
+                return (uint64_t) 0;
             }
             return (*strong_self)();
         });