diff --git a/Controller.js b/Controller.js
index d721464..3028a74 100644
--- a/Controller.js
+++ b/Controller.js
@@ -45,7 +45,7 @@
      */
     jsOMS.Modules.Navigation.prototype.bind = function (id)
     {
-        let e      = typeof id === 'undefined' ? document.getElementsByClassName('nav') : [document.getElementById(id)],
+        const e      = typeof id === 'undefined' ? document.getElementsByClassName('nav') : [document.getElementById(id)],
             length = e.length;
 
         for (let i = 0; i < length; i++) {
@@ -70,14 +70,14 @@
             return;
         }
 
-        let extend = e.querySelectorAll('li label'),
+        const extend = e.querySelectorAll('li label'),
             self   = this;
 
         this.navigation[e.id] = new jsOMS.Modules.Navigation.Models.Navigation(this.rawNavData[e.id]);
 
         // On load
-        let open = this.navigation[e.id].getOpen(),
-            ele = null;
+        const open = this.navigation[e.id].getOpen();
+        let ele = null;
 
         for (let key in open) {
             if (open.hasOwnProperty(key) && (ele = document.getElementById(key)) !== null) {