diff --git a/blocks/site_main_menu/block_site_main_menu.php b/blocks/site_main_menu/block_site_main_menu.php
index 42d9e61cddb..bc6cdc2dbb9 100644
--- a/blocks/site_main_menu/block_site_main_menu.php
+++ b/blocks/site_main_menu/block_site_main_menu.php
@@ -14,6 +14,9 @@
 // You should have received a copy of the GNU General Public License
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
+defined('MOODLE_INTERNAL') || die();
+require_once($CFG->dirroot . '/course/lib.php');
+
 /**
  * Site main menu block.
  *