diff --git a/action.php b/action.php
index 953bb29..81e28d9 100644
--- a/action.php
+++ b/action.php
@@ -18,7 +18,7 @@
  * need to inherit from this class
  */
 class action_plugin_filterrss extends DokuWiki_Action_Plugin {
-    function register(&$controller) {
+    function register(Doku_Event_Handler $controller) {
 	$controller->register_hook('PARSER_CACHE_USE', 'BEFORE', $this, '_preventCache', array ());
     }
     /**
diff --git a/syntax.php b/syntax.php
index c191302..dad3a9c 100644
--- a/syntax.php
+++ b/syntax.php
@@ -31,7 +31,7 @@ function connectTo($mode) {
 	$this->Lexer->addSpecialPattern('\[filterrss.*?\]',$mode,'plugin_filterrss');
     }
 
-    function handle($match, $state, $pos, &$handler) {
+    function handle($match, $state, $pos, Doku_Handler $handler) {
 
 	//Remove ] from the end
 	$match = substr($match, 0, -1);
@@ -133,7 +133,7 @@ function handle($match, $state, $pos, &$handler) {
 	return array('url' => $url, 'conditions' => $cond_output, 'order_by' => $order_by, 'desc' => $desc, 'limit' => $limit);
     }
 
-    function render($mode, &$renderer, $data) {
+    function render($mode, Doku_Renderer $renderer, $data) {
         if($mode == 'xhtml') {
 
 	    $filterrss =& plugin_load('helper', 'filterrss');