diff --git a/cocos/base/ccUtils.cpp b/cocos/base/ccUtils.cpp
index 6ddb4451b6..f02c76d6b4 100644
--- a/cocos/base/ccUtils.cpp
+++ b/cocos/base/ccUtils.cpp
@@ -164,7 +164,7 @@ double gettime()
 long long getTimeInMilliseconds()
 {
     struct timeval tv;
-    gettimeofday (&tv, NULL);
+    gettimeofday (&tv, nullptr);
     return tv.tv_sec * 1000 + tv.tv_usec / 1000;
 }