diff --git a/blocks/recent_activity/block_recent_activity.php b/blocks/recent_activity/block_recent_activity.php
index c4d2f555ecb..83b146afff7 100644
--- a/blocks/recent_activity/block_recent_activity.php
+++ b/blocks/recent_activity/block_recent_activity.php
@@ -1,5 +1,7 @@
 <?php
 
+require_once($CFG->dirroot.'/course/lib.php');
+
 class block_recent_activity extends block_base {
     function init() {
         $this->title = get_string('pluginname', 'block_recent_activity');