diff --git a/mod/quiz/renderer.php b/mod/quiz/renderer.php
index e9fc84c6f1dde..92b3cb6d19aad 100644
--- a/mod/quiz/renderer.php
+++ b/mod/quiz/renderer.php
@@ -560,7 +560,8 @@ protected function attempt_navigation_buttons($page, $lastpage, $navmethod = 'fr
      */
     public function redo_question_button($slot, $disabled) {
         $attributes = array('type' => 'submit',  'name' => 'redoslot' . $slot,
-                'value' => get_string('redoquestion', 'quiz'), 'class' => 'mod_quiz-redo_question_button');
+            'value' => get_string('redoquestion', 'quiz'),
+            'class' => 'mod_quiz-redo_question_button btn btn-secondary');
         if ($disabled) {
             $attributes['disabled'] = 'disabled';
         }