diff --git a/mod/workshop/lang/en_utf8/workshop.php b/mod/workshop/lang/en_utf8/workshop.php
index 4ef0e98ea08..e985496a98e 100644
--- a/mod/workshop/lang/en_utf8/workshop.php
+++ b/mod/workshop/lang/en_utf8/workshop.php
@@ -28,7 +28,7 @@ defined('MOODLE_INTERNAL') || die();
 $string[''] = '';
 $string[''] = '';
 $string[''] = '';
-$string['null'] = '?';
+$string['nullgrade'] = '?';
 $string['formatpeergradeover'] = '$a->grade (<del>$a->gradinggrade</del> / <ins>$a->gradinggradeover</ins>)';
 $string['formatpeergrade'] = '$a->grade ($a->gradinggrade)';
 $string['accesscontrol'] = 'Access control';