diff --git a/rubref.php b/rubref.php
index 5467ea5..a8b29f9 100644
--- a/rubref.php
+++ b/rubref.php
@@ -22,6 +22,8 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+ defined('MOODLE_INTERNAL') || die();
+
 require(__DIR__ . '../../../config.php');
 require_once(__DIR__ . '/../../report/advancedgrading/locallib.php');
 require_once(__DIR__ . '/../../lib/excellib.class.php');
diff --git a/rubric.php b/rubric.php
index 25a2897..b97c484 100644
--- a/rubric.php
+++ b/rubric.php
@@ -22,6 +22,8 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+ defined('MOODLE_INTERNAL') || die();
+
 require(__DIR__ . '../../../config.php');
 require_once(__DIR__ . '/../../report/advancedgrading/locallib.php');
 require_once(__DIR__ . '/../../lib/excellib.class.php');