diff --git a/backbone/backbone.d.ts b/backbone/backbone.d.ts
index b9aaa3e1c..e05150c64 100644
--- a/backbone/backbone.d.ts
+++ b/backbone/backbone.d.ts
@@ -319,7 +319,7 @@ declare module Backbone {
         remove(): View;
         make(tagName: any, attributes?: any, content?: any): any;
         delegateEvents(events?: any): any;
-        undelegateEvents();
+        undelegateEvents(): any;
 
         _ensureElement(): void;
     }