diff --git a/inc/CalDAVRequest.php b/inc/CalDAVRequest.php
index eef333f4..16f89adb 100644
--- a/inc/CalDAVRequest.php
+++ b/inc/CalDAVRequest.php
@@ -309,7 +309,7 @@ class CalDAVRequest
         }
         $response = new XMLElement( "multistatus", new XMLElement( 'response', $response), array('xmlns'=>'DAV:') );
         $xmldoc = $response->Render(0,'<?xml version="1.0" encoding="utf-8" ?>');
-        $request->DoResponse( 207, $xmldoc, 'text/xml; charset="utf-8"' );
+        $this->DoResponse( 207, $xmldoc, 'text/xml; charset="utf-8"' );
         // Which we won't come back from
       }
       return $existing_lock;