diff --git a/lib/archive/tar.php b/lib/archive/tar.php
index 117d88e5f4..e7c8138961 100644
--- a/lib/archive/tar.php
+++ b/lib/archive/tar.php
@@ -6,7 +6,7 @@
  * See the COPYING-README file.
  */
 
-require_once 'Archive/Tar.php';
+require_once OC::$THIRDPARTYROOT . '/3rdparty/Archive/Tar.php';
 
 class OC_Archive_TAR extends OC_Archive{
 	const PLAIN=0;