diff --git a/group/index.php b/group/index.php
index de4039c7b09..2dd702e7fd3 100644
--- a/group/index.php
+++ b/group/index.php
@@ -10,7 +10,9 @@
  */
 require_once('../config.php');
 require_once('lib.php');
-require_once($CFG->libdir.'/pear/HTML/AJAX/JSON.php');
+
+ini_set('include_path', $CFG->libdir.'/pear'.PATH_SEPARATOR.ini_get('include_path'));
+require_once('HTML/AJAX/JSON.php');
 
 require_js(array('yui_yahoo', 'yui_dom', 'yui_utilities', 'yui_connection'));
 require_js('group/clientlib.js');