diff --git a/include/ajax.users.php b/include/ajax.users.php
index bad2bb7fe65af4c1bf022f5abdef858d77173f1d..e49c705a8b19c219dce92677f377537e18630863 100644
--- a/include/ajax.users.php
+++ b/include/ajax.users.php
@@ -215,8 +215,9 @@ class UsersAjaxAPI extends AjaxController {
 
         $info['title'] = 'Add New User';
 
+        $info['lookup'] = 'remote';
         if (!AuthenticationBackend::getSearchDirectories())
-            $info['lookup'] = 'local';
+            $info['lookup'] = false;
 
         if ($_POST) {
             $form = UserForm::getUserForm()->getForm($_POST);