diff --git a/main/inc/lib/add_many_session_to_category_functions.lib.php b/main/inc/lib/add_many_session_to_category_functions.lib.php
index 05efe80b70..9f5e7593bb 100644
--- a/main/inc/lib/add_many_session_to_category_functions.lib.php
+++ b/main/inc/lib/add_many_session_to_category_functions.lib.php
@@ -7,7 +7,7 @@
 /**
  * Init
  */
-require_once (api_get_path(LIBRARY_PATH).'xajax/xajax.inc.php');
+require_once dirname(__FILE__).'/xajax/xajax.inc.php';
 /**
  * AddManySessionToCategoryFunctions class
  */