diff --git a/lib/local-storage.js b/lib/local-storage.js
index b9b227b58..637007e41 100644
--- a/lib/local-storage.js
+++ b/lib/local-storage.js
@@ -372,10 +372,14 @@ class Storage {
       } else {
         cb(Error[404]('no such file available'));
       }
-    }, function(err) {
-      if (err) return callback(err);
+    }, (err) => {
+      if (err) {
+        return callback(err);
+      }
       let storage = this.storage(name);
-      if (storage) storage.unlink(filename, callback);
+      if (storage) {
+        storage.unlink(filename, callback);
+      }
     });
   }