diff --git a/action.php b/action.php
index 7fdd60d..bd6fff0 100644
--- a/action.php
+++ b/action.php
@@ -12,7 +12,7 @@
 
 class action_plugin_widearea extends DokuWiki_Action_Plugin {
 
-    function register(&$controller) {
+    function register(Doku_Event_Handler $controller) {
         $controller->register_hook('TPL_METAHEADER_OUTPUT', 'BEFORE', $this, 'handle_tpl_metaheader', array());
     }