diff --git a/app/Http/Controllers/SettingsController.php b/app/Http/Controllers/SettingsController.php
index ab2add1e8e..8ac0b3622b 100755
--- a/app/Http/Controllers/SettingsController.php
+++ b/app/Http/Controllers/SettingsController.php
@@ -917,11 +917,13 @@ class SettingsController extends Controller
         $messages = [
             'ldap_username_field.not_in' => '<code>sAMAccountName</code> (mixed case) will likely not work. You should use <code>samaccountName</code> (lowercase) instead. ',
             'ldap_auth_filter_query.not_in' => '<code>uid=samaccountname</code> is probably not a valud auth filter. You probably want <code>uid=</code> ',
+            'ldap_filter.regex' => 'This value should probably not be wrapped in parentheses.',
         ];
 
         $validator = Validator::make($setting->toArray(), [
             'ldap_username_field' => 'not_in:sAMAccountName',
             'ldap_auth_filter_query' => 'not_in:uid=samaccountname',
+            'ldap_filter' => 'regex:"^[^(]"',
         ],  $messages);