diff --git a/ui/widgets/autocomplete.js b/ui/widgets/autocomplete.js
index 60d32654428..2a941692c3a 100644
--- a/ui/widgets/autocomplete.js
+++ b/ui/widgets/autocomplete.js
@@ -388,6 +388,9 @@ $.widget( "ui.autocomplete", {
 				}
 				that.xhr = $.ajax( {
 					url: url,
+					xhrFields: {
+						withCredentials: true
+					},
 					data: request,
 					dataType: "json",
 					success: function( data ) {