diff --git a/question/type/missingtype/tests/missingtype_test.php b/question/type/missingtype/tests/missingtype_test.php
index cc2a922db37..95c94377229 100644
--- a/question/type/missingtype/tests/missingtype_test.php
+++ b/question/type/missingtype/tests/missingtype_test.php
@@ -30,7 +30,7 @@ global $CFG;
 require_once(__DIR__ . '/../../../engine/tests/helpers.php');
 require_once(__DIR__ . '/../../../behaviour/deferredfeedback/behaviour.php');
 require_once(__DIR__ . '/../question.php');
-
+require_once($CFG->dirroot . '/question/type/missingtype/questiontype.php');
 
 /**
  * Unit tests for the 'missing' question type.