diff --git a/syntax.php b/syntax.php
index c91bdf1..905e706 100644
--- a/syntax.php
+++ b/syntax.php
@@ -196,7 +196,7 @@ class syntax_plugin_filelist extends DokuWiki_Syntax_Plugin {
      * @param $renderer the renderer to use
      * @return void
      */
-    function _render_link($filename, $filepath, $basedir, $webdir, $params, &$renderer) {
+    function _render_link($filename, $filepath, $basedir, $webdir, $params, Doku_Renderer $renderer) {
         global $conf;
 
         //prepare for formating
@@ -243,7 +243,7 @@ class syntax_plugin_filelist extends DokuWiki_Syntax_Plugin {
      * @param $renderer the renderer to use
      * @return void
      */
-    protected function render_odt_link ($link, &$renderer) {
+    protected function render_odt_link ($link, Doku_Renderer $renderer) {
         if ( method_exists ($renderer, 'getODTProperties') === true ) {
             $properties = array ();
 
@@ -270,7 +270,7 @@ class syntax_plugin_filelist extends DokuWiki_Syntax_Plugin {
      * @param $renderer the renderer to use
      * @return void
      */
-    function _render_list($result, $params, &$renderer) {
+    function _render_list($result, $params, Doku_Renderer $renderer) {
         $this->_render_list_items($result['files'], $result['basedir'], $result['webdir'], $params, $renderer);
     }
 
@@ -285,7 +285,7 @@ class syntax_plugin_filelist extends DokuWiki_Syntax_Plugin {
      * @param $level the level to render
      * @return void
      */
-    function _render_list_items($files, $basedir, $webdir, $params, &$renderer, $level = 1) {
+    function _render_list_items($files, $basedir, $webdir, $params, Doku_Renderer $renderer, $level = 1) {
         if ($params['style'] == 'olist') {
             $renderer->listo_open();
         } else {
@@ -340,7 +340,7 @@ class syntax_plugin_filelist extends DokuWiki_Syntax_Plugin {
      * @param $renderer the renderer to use
      * @return void
      */
-    function _render_table($result, $params, $pos, &$renderer) {
+    function _render_table($result, $params, $pos, Doku_Renderer $renderer) {
         global $conf;
 
         $renderer->table_open(NULL, NULL, $pos);
@@ -417,7 +417,7 @@ class syntax_plugin_filelist extends DokuWiki_Syntax_Plugin {
      * @param $renderer the renderer to use
      * @return void
      */
-    function _render_page($result, $params, &$renderer) {
+    function _render_page($result, $params, Doku_Renderer $renderer) {
         if ( method_exists ($renderer, 'getLastlevel') === false ) {
             $class_vars = get_class_vars (get_class($renderer));
             if ($class_vars ['lastlevel'] !== NULL) {
@@ -445,7 +445,7 @@ class syntax_plugin_filelist extends DokuWiki_Syntax_Plugin {
      * @param $level the level to render
      * @return void
      */
-    function _render_page_section($files, $basedir, $webdir, $params, &$renderer, $level) {
+    function _render_page_section($files, $basedir, $webdir, $params, Doku_Renderer $renderer, $level) {
         $trees = array();
         $leafs = array();
 
@@ -473,6 +473,29 @@ class syntax_plugin_filelist extends DokuWiki_Syntax_Plugin {
         }
     }
 
+    /**
+     * Render a preview item for file $filepath.
+     *
+     * @param $filepath the file for which a preview image shall be rendered
+     * @param $basedir the basedir to use
+     * @param $webdir the webdir to use
+     * @param $params the parameters of the filelist call
+     * @param $renderer the renderer to use
+     * @return void
+     */
+    protected function _render_preview_image ($filepath, $basedir, $webdir, $params, Doku_Renderer $renderer) {
+        $imagepath = $this->get_preview_image_path($filepath, $params);
+        if (!empty($imagepath)) {
+            $imgLink = $this->_get_link_url ($imagepath, $basedir, $webdir, 0, $params['direct']);
+
+            $previewsize = $params['previewsize'];
+            if ($previewsize == 0) {
+                $previewsize = 32;
+            }
+            $renderer->doc .= '<img style=" max-height: '.$previewsize.'px; max-width: '.$previewsize.'px;" src="'.$imgLink.'">';
+        }
+    }
+
     //~~ Filelist functions
 
     /**
@@ -924,29 +947,6 @@ class syntax_plugin_filelist extends DokuWiki_Syntax_Plugin {
         return $imagepath;
     }
 
-    /**
-     * Render a preview item for file $filepath.
-     *
-     * @param $filepath the file for which a preview image shall be rendered
-     * @param $basedir the basedir to use
-     * @param $webdir the webdir to use
-     * @param $params the parameters of the filelist call
-     * @param $renderer the renderer to use
-     * @return void
-     */
-    protected function _render_preview_image ($filepath, $basedir, $webdir, $params, Doku_Renderer $renderer) {
-        $imagepath = $this->get_preview_image_path($filepath, $params);
-        if (!empty($imagepath)) {
-            $imgLink = $this->_get_link_url ($imagepath, $basedir, $webdir, 0, $params['direct']);
-
-            $previewsize = $params['previewsize'];
-            if ($previewsize == 0) {
-                $previewsize = 32;
-            }
-            $renderer->doc .= '<img style=" max-height: '.$previewsize.'px; max-width: '.$previewsize.'px;" src="'.$imgLink.'">';
-        }
-    }
-
     /**
      * Create URL for file $filepath.
      *