diff --git a/mod/hotpot/mod_form.php b/mod/hotpot/mod_form.php
index 7583d6680b2..79a3fc440f8 100644
--- a/mod/hotpot/mod_form.php
+++ b/mod/hotpot/mod_form.php
@@ -266,7 +266,7 @@ class mod_hotpot_mod_form extends moodleform_mod {
     }
 
     function validation($data, $files) {
-        global $CFG, $USER, $DB;
+        global $CFG, $USER, $DB, $COURSE;
 
         $errors = parent::validation($data, $files);