diff --git a/jqueryui/jqueryui.d.ts b/jqueryui/jqueryui.d.ts
index 5cd04f22d9..d5e60cd0de 100644
--- a/jqueryui/jqueryui.d.ts
+++ b/jqueryui/jqueryui.d.ts
@@ -341,7 +341,7 @@ declare module JQueryUI {
 
     interface DialogOptions extends DialogEvents {
         autoOpen?: boolean;
-        buttons?: { [buttonText: string]: () => void } | ButtonOptions[];
+        buttons?: { [buttonText: string]: (event?: Event) => void } | ButtonOptions[];
         closeOnEscape?: boolean;
         closeText?: string;
         dialogClass?: string;