diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-results.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-results.tt
index bc20b47831..42e25e27cc 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-results.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-results.tt
@@ -163,7 +163,7 @@
                                         [% UNLESS tag %]
                                             <div class="sort_by pull-right">
                                                 <select id="sort_by" class="resort" name="sort_by"> [% INCLUDE 'resort_form.inc' %] </select>
-                                                <input type="submit" class="btn btn-small clearfix" id="sortsubmit" value="Go" />
+                                                <input type="submit" class="btn btn-sm clearfix" id="sortsubmit" value="Go" />
                                             </div>
                                         [% END %]
                                     </div> <!-- / #toolbar -->