diff --git a/grade/report/grader/index.php b/grade/report/grader/index.php
index 7885fdc90d8..43917fa9746 100644
--- a/grade/report/grader/index.php
+++ b/grade/report/grader/index.php
@@ -188,7 +188,8 @@ if ($USER->gradeediting[$course->id] && ($report->get_pref('showquickfeedback')
     echo '<input type="hidden" value="grader" name="report"/>';
     echo '<input type="hidden" value="'.$page.'" name="page"/>';
     echo $reporthtml;
-    echo '<div class="submit"><input type="submit" id="gradersubmit" value="'.s(get_string('savechanges')).'" /></div>';
+    echo '<div class="submit"><input type="submit" id="gradersubmit" class="btn btn-primary"
+        value="'.s(get_string('savechanges')).'" /></div>';
     echo '</div></form>';
 } else {
     echo $reporthtml;