diff --git a/tests/external/trigger_event_cm_viewed_test.php b/tests/external/trigger_event_cm_viewed_test.php
index 96e09f2..8cb4e93 100644
--- a/tests/external/trigger_event_cm_viewed_test.php
+++ b/tests/external/trigger_event_cm_viewed_test.php
@@ -5,6 +5,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 
+use core_completion\cm_completion_details;
 use local_adler\lib\adler_externallib_testcase;
 use local_adler\local\exceptions\not_an_adler_cm_exception;
 use local_adler\local\exceptions\not_an_adler_course_exception;