diff --git a/lib/plugins/plugin.inc.php b/lib/plugins/plugin.inc.php
index 8e6840e..a08a85c 100644
--- a/lib/plugins/plugin.inc.php
+++ b/lib/plugins/plugin.inc.php
@@ -184,7 +184,7 @@ class KTPlugin {
 
 
     function registerCriterion($sClassName, $sNamespace, $sFilename = null, $aInitialize = null) {
-        $this->_fixFilename($sFilename);
+        $sFilename = $this->_fixFilename($sFilename);
         $this->_aCriteria[$sNamespace] = array($sClassName, $sNamespace, $sFilename, $aInitialize);
     }