diff --git a/login/tests/notifications_test.php b/login/tests/notifications_test.php
index 41c93cdf124ef..cd5969c598791 100644
--- a/login/tests/notifications_test.php
+++ b/login/tests/notifications_test.php
@@ -23,6 +23,15 @@
  */
 class core_login_notifications_testcase extends \advanced_testcase {
 
+    /**
+     * Load required classes
+     */
+    public static function setUpBeforeClass(): void {
+        global $CFG;
+
+        require_once($CFG->libdir . '/externallib.php');
+    }
+
     /**
      * Test new login notification.
      */