diff --git a/inc/parser/renderer.php b/inc/parser/renderer.php
index f050e6eac9ed1276189a6ba0874e9f5bed6ef35f..0923e6896213a84b445d2c78d30f6e5054b17142 100644
--- a/inc/parser/renderer.php
+++ b/inc/parser/renderer.php
@@ -20,6 +20,8 @@ class Doku_Renderer extends DokuWiki_Plugin {
         'toc'   => true, // render the TOC?
     );
 
+    var $doc = '';
+
     // keep some config options
     var $acronyms = array();
     var $smileys = array();