diff --git a/action/es.php b/action/es.php
index 604bb56..3909a48 100644
--- a/action/es.php
+++ b/action/es.php
@@ -20,7 +20,7 @@ class action_plugin_editsections_es extends DokuWiki_Action_Plugin {
 
 	var $sections;
 
-	function register(&$controller) {
+	function register(Doku_Event_Handler $controller) {
 		$doku_version = getVersionData();
 		if ( preg_match('/201.-/', $doku_version['date']) > 0 ) {
 			// 2010 or later version