diff --git a/HISTORY b/HISTORY
index d053ac8..e8a0df1 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,5 +1,5 @@
 
-Version 1.44  2020-10-19
+Version 1.44  2020-10-21
   * add test file src/tests/test_pthread_lock.c
   * add uniq_skiplist.[hc]
   * add function split_string_ex
diff --git a/src/fast_task_queue.h b/src/fast_task_queue.h
index b0bbd5f..37a02f1 100644
--- a/src/fast_task_queue.h
+++ b/src/fast_task_queue.h
@@ -85,7 +85,7 @@ struct fast_task_info
     uint16_t port; //peer port
     struct {
         uint8_t current;
-        uint8_t notify;
+        volatile uint8_t notify;
     } nio_stages; //stages for network IO
     bool canceled;   //if task canceled
     int connect_timeout; //for client side