diff --git a/cocos/platform/CCFileUtils.cpp b/cocos/platform/CCFileUtils.cpp
index 70769a485d..13d5940b9a 100644
--- a/cocos/platform/CCFileUtils.cpp
+++ b/cocos/platform/CCFileUtils.cpp
@@ -1108,7 +1108,7 @@ bool FileUtils::createDirectory(const std::string& path)
 }
 
 #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS) || (CC_TARGET_PLATFORM == CC_PLATFORM_MAC)
-int unlink_cb(const char *fpath, const struct stat *sb, int typeflag, struct FTW *ftwbuf)
+static int unlink_cb(const char *fpath, const struct stat *sb, int typeflag, struct FTW *ftwbuf)
 {
     auto ret = remove(fpath);
     if (ret) {