diff --git a/base/src/event_reactor.h b/base/src/event_reactor.h
index 83139bdc6277a4153a068696ddcba0d504cc7d26..5ebd548aa5dea56ae34119a39f2450298ac1fd7b 100644
--- a/base/src/event_reactor.h
+++ b/base/src/event_reactor.h
@@ -16,6 +16,7 @@
 #ifndef UTILS_EVENT_REACTOR_H
 #define UTILS_EVENT_REACTOR_H
 
+#include <atomic>
 #include <sys/types.h>
 #include <cstdint>
 #include <memory>
@@ -69,7 +70,7 @@ public:
 
 private:
     mutable volatile bool loopReady_; // refers to whether reactor is ready to call RunLoop().
-    volatile bool switch_; // a switch to enable while-loop in RunLoop(). true: start, false: stop.
+    std::atomic<bool> switch_; // a switch to enable while-loop in RunLoop(). true: start, false: stop.
     std::unique_ptr<EventDemultiplexer> demultiplexer_;
     std::recursive_mutex mutex_;
     std::list<std::shared_ptr<TimerEventHandler>> timerEventHandlers_;