diff --git a/wagtail/wagtailadmin/templates/wagtailadmin/chooser/_search_behaviour.js b/wagtail/wagtailadmin/templates/wagtailadmin/chooser/_search_behaviour.js
index 9c3f77154..a3fee7722 100644
--- a/wagtail/wagtailadmin/templates/wagtailadmin/chooser/_search_behaviour.js
+++ b/wagtail/wagtailadmin/templates/wagtailadmin/chooser/_search_behaviour.js
@@ -1,6 +1,6 @@
-modal.ajaxifyForm($('form.search-bar', modal.body));
+modal.ajaxifyForm($('form.search-form', modal.body));
 
-var searchUrl = $('form.search-bar', modal.body).attr('action');
+var searchUrl = $('form.search-form', modal.body).attr('action');
 
 function search() {
     $.ajax({