diff --git a/js/settings.js b/js/settings.js
index 3e35dbf..859e549 100644
--- a/js/settings.js
+++ b/js/settings.js
@@ -20,7 +20,7 @@
         validateSetting: function (settingName) {
                 var validSettings = [
                         'claim_userid', 'claim_email', 'claim_displayname',
-                        'claim_prefix', 'backend_autoupdate'
+                        'claim_prefix', 'backend_autoupdate', 'backend_mode'
                 ];
                 if ($.inArray(settingName, validSettings) > -1) {
                         return true;