diff --git a/inc/indexer.php b/inc/indexer.php
index 5ab0ec002bfbc62cee109308b326390475881930..2e36b6ed7ff380f2624827b44906b6e298646669 100644
--- a/inc/indexer.php
+++ b/inc/indexer.php
@@ -10,7 +10,7 @@
 if(!defined('DOKU_INC')) die('meh.');
 
 // Version tag used to force rebuild on upgrade
-define('INDEXER_VERSION', 3);
+define('INDEXER_VERSION', 4);
 
 // set the minimum token length to use in the index (note, this doesn't apply to numeric tokens)
 if (!defined('IDX_MINWORDLENGTH')) define('IDX_MINWORDLENGTH',2);