diff --git a/lib/storage.js b/lib/storage.js
index ee7a18d..c2d46d5 100644
--- a/lib/storage.js
+++ b/lib/storage.js
@@ -332,7 +332,7 @@ exports.has = function(key, options, callback) {
       dataPath: options.dataPath
     })),
     function(filename, done) {
-      fs.stat(filename, (error) => {
+      fs.stat(filename, function(error) {
         if (error) {
           if (error.code === 'ENOENT') {
             return done(null, false);
diff --git a/lib/utils.js b/lib/utils.js
index e55d49f..649dc6b 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -39,7 +39,7 @@ const app = electron.app || electron.remote.app;
  * @example
  * const defaultDataPath = utils.getDefaultDataPath()
  */
-exports.getDefaultDataPath = () => {
+exports.getDefaultDataPath = function() {
   return path.join(app.getPath('userData'), 'storage');
 };