diff --git a/blocks/myoverview/classes/output/main.php b/blocks/myoverview/classes/output/main.php
index e7896e08d0a..6215a5a372d 100644
--- a/blocks/myoverview/classes/output/main.php
+++ b/blocks/myoverview/classes/output/main.php
@@ -29,6 +29,8 @@ use renderer_base;
 use templatable;
 use core_completion\progress;
 
+require_once($CFG->libdir . '/completionlib.php');
+
 /**
  * Class containing data for my overview block.
  *