diff --git a/include/fc/thread/task.hpp b/include/fc/thread/task.hpp
index f86ce37..664a5db 100644
--- a/include/fc/thread/task.hpp
+++ b/include/fc/thread/task.hpp
@@ -13,7 +13,7 @@ namespace fc {
       void        run(); 
     protected:
       ~task_base();
-
+      /// Task priority looks like unsupported feature.
       uint64_t    _posted_num;
       priority    _prio;
       time_point  _when;
diff --git a/src/thread/task.cpp b/src/thread/task.cpp
index c6c6a0e..b963f2c 100644
--- a/src/thread/task.cpp
+++ b/src/thread/task.cpp
@@ -9,7 +9,12 @@
 
 namespace fc {
   task_base::task_base(void* func)
-  :_functor(func){
+  :
+  _posted_num(0),
+  _active_context(nullptr),
+  _next(nullptr),
+  _promise_impl(nullptr),
+  _functor(func){
   }
 
   void task_base::run() {