diff --git a/mod/quiz/mod_form.php b/mod/quiz/mod_form.php
index d2938baf8f8..abe9b980004 100644
--- a/mod/quiz/mod_form.php
+++ b/mod/quiz/mod_form.php
@@ -534,9 +534,9 @@ class mod_quiz_mod_form extends moodleform_mod {
         }
 
         if (array_key_exists('completion', $data) && $data['completion'] == COMPLETION_TRACKING_AUTOMATIC) {
-            // Show an error if require passing grade was selected and the grade to pass was setted to 0.
+            // Show an error if require passing grade was selected and the grade to pass was set to 0.
             if ($data['completionpass'] == 1 && (empty($data['gradepass']) || grade_floatval($data['gradepass']) == 0)) {
-                $errors['gradepass'] = get_string('gradetopassnotset', 'quiz');
+                $errors['completionpassgroup'] = get_string('gradetopassnotset', 'quiz');
             }
         }