diff --git a/server/moodle/mod/livequiz/tests/phpunit/lib_test.php b/server/moodle/mod/livequiz/tests/phpunit/lib_test.php
index 3b3cefec2..620749575 100644
--- a/server/moodle/mod/livequiz/tests/phpunit/lib_test.php
+++ b/server/moodle/mod/livequiz/tests/phpunit/lib_test.php
@@ -41,6 +41,7 @@ protected function setUp(): void {
      * It should return false if the instance cannot be added.
      */
     public function test_livequiz_add_instance(): void {
+        require_once(__DIR__ . '/../../lib.php');
         global $DB;
 
         $quizdata = new \stdClass(); // Create a new stdClass object (empty object).