diff --git a/rx.backpressure-lite.d.ts b/rx.backpressure-lite.d.ts
index d1c244195..9d4027be6 100644
--- a/rx.backpressure-lite.d.ts
+++ b/rx.backpressure-lite.d.ts
@@ -15,8 +15,7 @@ declare module Rx {
 		* @param pauser The observable sequence used to pause the underlying sequence.
 		* @returns The observable sequence which is paused based upon the pauser.
 		*/
-		pausable(pauser: Observable<boolean>): Observable<T>;
-		pausable(pauser?: ISubject<boolean>): PausableObservable<T>;
+		pausable(pauser?: Observable<boolean>): PausableObservable<T>;
 
 		/**
 		* Pauses the underlying observable sequence based upon the observable sequence which yields true/false,
@@ -27,7 +26,7 @@ declare module Rx {
 		* @param pauser The observable sequence used to pause the underlying sequence.
 		* @returns The observable sequence which is paused based upon the pauser.
 		*/
-		pausableBuffered(pauser?: ISubject<boolean>): PausableObservable<T>;
+		pausableBuffered(pauser?: Observable<boolean>): PausableObservable<T>;
 
 		/**
 		* Attaches a controller to the observable sequence with the ability to queue.