diff --git a/filter/manage.php b/filter/manage.php
index 2f12478a406..bff72f847a0 100644
--- a/filter/manage.php
+++ b/filter/manage.php
@@ -202,7 +202,8 @@ if (empty($availablefilters)) {
 
     echo html_writer::table($table);
     echo html_writer::start_tag('div', array('class'=>'buttons'));
-    echo html_writer::empty_tag('input', array('type'=>'submit', 'name'=>'savechanges', 'value'=>get_string('savechanges')));
+    $submitattr = ['type' => 'submit', 'name' => 'savechanges', 'value' => get_string('savechanges'), 'class' => 'btn btn-primary'];
+    echo html_writer::empty_tag('input', $submitattr);
     echo html_writer::end_tag('div');
     echo html_writer::end_tag('div');
     echo html_writer::end_tag('form');