diff --git a/cocos2dx/layers_scenes_transitions_nodes/CCLayer.cpp b/cocos2dx/layers_scenes_transitions_nodes/CCLayer.cpp
index bf2e3be0f7..ae5d984085 100644
--- a/cocos2dx/layers_scenes_transitions_nodes/CCLayer.cpp
+++ b/cocos2dx/layers_scenes_transitions_nodes/CCLayer.cpp
@@ -402,7 +402,7 @@ void Layer::onExit()
     // remove this layer from the delegates who concern Accelerometer Sensor
     if (_accelerometerEnabled)
     {
-        pDirector->getAccelerometer()->setDelegate(NULL);
+		pDirector->getAccelerometer()->setDelegate(nullptr);
     }
 
     // remove this layer from the delegates who concern the keypad msg