diff --git a/lib/utils/file-util.js b/lib/utils/file-util.js
index <HASH>..<HASH> 100644
--- a/lib/utils/file-util.js
+++ b/lib/utils/file-util.js
@@ -6,7 +6,7 @@ var fs = require('fs');
  * Check the existence of the file
  */
 function checkFileExistsSync(filepath){
-  let flag = true;
+  var flag = true;
 
   try {
     fs.accessSync(filepath, fs.F_OK);
Use var rather than let for pre-ES6 cross-compatibility