diff --git a/assets/js/backend_settings.js b/assets/js/backend_settings.js
index 61df8787..2e6092db 100644
--- a/assets/js/backend_settings.js
+++ b/assets/js/backend_settings.js
@@ -213,7 +213,7 @@ window.BackendSettings = window.BackendSettings || {};
          * Change the state of the Visible/Hidden button
          */
         $('.hide-toggle').on('click', function () {
-            let $input = $(this);
+            var $input = $(this);
             $input.find("div").toggleClass("hidden");
         });
 
@@ -238,7 +238,7 @@ window.BackendSettings = window.BackendSettings || {};
          * @return the state of the button. True for visible, false for hidden.
          */
         function getShowToggleValue($element){
-            let visiblePartArray = $element.find(".hide-toggle-visible");
+            var visiblePartArray = $element.find(".hide-toggle-visible");
             return !visiblePartArray.hasClass("hidden");
         }
 
diff --git a/assets/js/backend_settings_system.js b/assets/js/backend_settings_system.js
index 723df1ea..870dc4f8 100644
--- a/assets/js/backend_settings_system.js
+++ b/assets/js/backend_settings_system.js
@@ -73,8 +73,8 @@
      * @return '0' when the button shows 'invisible' and '1' when the button shows 'visible'. Will always return '0' on an error.
      */
     function getToggleButtonState($element) {
-        let visiblePartArray = $element.find(".hide-toggle-visible");
-        let invisiblePartArray = $element.find(".hide-toggle-hidden");
+        var visiblePartArray = $element.find(".hide-toggle-visible");
+        var invisiblePartArray = $element.find(".hide-toggle-hidden");
         if (!(visiblePartArray.length === 0 || invisiblePartArray.length === 0)) {
             if (visiblePartArray.hasClass("hidden")){//our button is currently invisible
                 return '0';//invisible