diff --git a/enrol/mnet/db/mnet.php b/enrol/mnet/db/mnet.php
index 10deee7a3be..495575b735a 100644
--- a/enrol/mnet/db/mnet.php
+++ b/enrol/mnet/db/mnet.php
@@ -27,6 +27,8 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 $publishes = array(
     'mnet_enrol' => array(
         'apiversion' => 1,
diff --git a/enrol/mnet/db/upgrade.php b/enrol/mnet/db/upgrade.php
index 6c5dc846ea4..23effc5adc7 100644
--- a/enrol/mnet/db/upgrade.php
+++ b/enrol/mnet/db/upgrade.php
@@ -24,6 +24,8 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 function xmldb_enrol_mnet_upgrade($oldversion) {
     global $CFG, $DB, $OUTPUT;
 
diff --git a/enrol/mnet/version.php b/enrol/mnet/version.php
index d25e5cb8dd1..b6c8fa603c1 100644
--- a/enrol/mnet/version.php
+++ b/enrol/mnet/version.php
@@ -24,4 +24,6 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 $plugin->version = 2010071701;