diff --git a/public_html/lib/plugins/groupmanager/plugin.info.txt b/public_html/lib/plugins/groupmanager/plugin.info.txt
index c4c278d0..a9e6180c 100644
--- a/public_html/lib/plugins/groupmanager/plugin.info.txt
+++ b/public_html/lib/plugins/groupmanager/plugin.info.txt
@@ -1,7 +1,7 @@
 base   groupmanager
 author Harald Ronge
 email  harald@turtur.nl
-date   2010-11-28
+date   2013-05-27
 name   groupmanager plugin
 desc   Embeddable group manager
 url    http://www.turtur.nl/
diff --git a/public_html/lib/plugins/groupmanager/syntax.php b/public_html/lib/plugins/groupmanager/syntax.php
index a7aaa0df..c3cda861 100644
--- a/public_html/lib/plugins/groupmanager/syntax.php
+++ b/public_html/lib/plugins/groupmanager/syntax.php
@@ -138,7 +138,7 @@ class syntax_plugin_groupmanager extends DokuWiki_Syntax_Plugin
      * Handle match
      */
 // is called without config, but do not know by whom, possibly with literal match
-    function handle($match, $state, $pos, &$handler)
+    function handle($match, $state, $pos, Doku_Handler $handler)
     {
 // groupmanager only
         $data = array(null, $state, $pos);
@@ -171,7 +171,7 @@ class syntax_plugin_groupmanager extends DokuWiki_Syntax_Plugin
     /**
      * Render it
      */
-    function render($mode, &$renderer, $data)
+    function render($mode, Doku_Renderer $renderer, $data)
     {
         // start usermanager
         global $auth;