diff --git a/action.php b/action.php
index f92fc82..8876c18 100644
--- a/action.php
+++ b/action.php
@@ -32,7 +32,7 @@ function getInfo(){
 /******************************************************************************
 **  Register its handlers with the dokuwiki's event controller
 */
-     function register(&$controller) {
+     function register(Doku_Event_Handler $controller) {
          $controller->register_hook('ACTION_ACT_PREPROCESS', 'BEFORE', $this, '_handle_act', array());
          $controller->register_hook('TPL_ACT_UNKNOWN', 'BEFORE', $this, 'output', array());
      }
diff --git a/syntax.php b/syntax.php
index bc946af..82b9ab9 100644
--- a/syntax.php
+++ b/syntax.php
@@ -32,7 +32,7 @@ function connectTo($mode){
 /******************************************************************************/
 /* Handle the match
 */
-    function handle($match, $state, $pos, &$handler){
+    function handle($match, $state, $pos, Doku_Handler $handler){
         $match = substr($match,8,-2); //strip markup from start and end
         
         //handle params
@@ -98,7 +98,7 @@ function handle($match, $state, $pos, &$handler){
 /******************************************************************************/
 /* Create output
 */
-    function render($mode, &$renderer, $data) {        
+    function render($mode, Doku_Renderer $renderer, $data) {        
         global $ID;          
         global $lang;
         global $conf;