diff --git a/ui/autocomplete.js b/ui/autocomplete.js
index 4b9ad0d069..209fa71ae9 100644
--- a/ui/autocomplete.js
+++ b/ui/autocomplete.js
@@ -40,7 +40,6 @@ $.widget( "ui.autocomplete", {
 	options: {
 		appendTo: null,
 		autoFocus: false,
-		classes: {},
 		delay: 300,
 		minLength: 1,
 		position: {