Index: modules/user.views.inc
===================================================================
--- modules/user.views.inc	(revision 35)
+++ modules/user.views.inc	(working copy)
@@ -85,6 +85,9 @@
     'sort' => array(
       'handler' => 'views_handler_sort',
     ),
+    'filter' => array(
+      'handler' => 'views_handler_filter_string',
+    ),
     'argument' => array(
       'handler' => 'views_handler_argument_string',
     ),