diff --git a/ui/ui.sortable.js b/ui/ui.sortable.js
index 614670c182..7a71794f37 100644
--- a/ui/ui.sortable.js
+++ b/ui/ui.sortable.js
@@ -983,6 +983,7 @@ $.widget("ui.sortable", $.extend({}, $.ui.mouse, {
 $.extend($.ui.sortable, {
 	getter: "serialize toArray",
 	version: "@VERSION",
+	eventPrefix: "sort",
 	defaults: {
 		accurateIntersection: true,
 		appendTo: "parent",