diff --git a/blog/rsslib.php b/blog/rsslib.php
index 366c5cd5654..760a0ea4221 100644
--- a/blog/rsslib.php
+++ b/blog/rsslib.php
@@ -22,6 +22,8 @@
  * @copyright  2010 Andrew Davis
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
+defined('MOODLE_INTERNAL') || die();
+
 require_once($CFG->dirroot.'/lib/rsslib.php');
 require_once($CFG->dirroot .'/blog/lib.php');