diff --git a/lib/plugins/acl/action.php b/lib/plugins/acl/action.php
index 92a93865c985166caddb64fdf47a8ab036453950..373d6cbb08aedb066730d881fabb875b7e2d8557 100644
--- a/lib/plugins/acl/action.php
+++ b/lib/plugins/acl/action.php
@@ -71,7 +71,6 @@ class action_plugin_acl extends DokuWiki_Action_Plugin {
             $acl->_html_info();
         }elseif($ajax == 'tree'){
 
-            $dir = $conf['datadir'];
             $ns  = $INPUT->str('ns');
             if($ns == '*'){
                 $ns ='';