diff --git a/rx.js/rx.js.d.ts b/rx.js/rx.js.d.ts
index 7e4e1466f..7baa2fd31 100644
--- a/rx.js/rx.js.d.ts
+++ b/rx.js/rx.js.d.ts
@@ -406,7 +406,7 @@ declare module Rx {
 		merge<T>(scheduler: IScheduler, sources: IObservable<T>[]): IObservable<T>;
 		onErrorResumeNext<T>(...sources: IObservable<T>[]): IObservable<T>;
 		onErrorResumeNext<T>(sources: IObservable<T>[]): IObservable<T>;
-		zip<TResult>(...soucesAndResultSelector: any[]): IObservable<TResult>;
+		zip<T>(...soucesAndResultSelector: any[]): IObservable<T>;
 	}
 
 	var Observable: Observable;