diff --git a/rx.js/rx.backpressure-lite.ts b/rx.js/rx.backpressure-lite.ts
new file mode 100644
index 0000000000..52ff182251
--- /dev/null
+++ b/rx.js/rx.backpressure-lite.ts
@@ -0,0 +1,39 @@
+// This file contains common part of defintions for rx.backpressure.d.ts and rx.lite.d.ts
+// Do not include the file separately.
+
+declare module Rx {
+	export interface Observable<T> {
+		/**
+		* Pauses the underlying observable sequence based upon the observable sequence which yields true/false.
+		* @example
+		* var pauser = new Rx.Subject();
+		* var source = Rx.Observable.interval(100).pausable(pauser);
+		* @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>;
+
+		/**
+		* Pauses the underlying observable sequence based upon the observable sequence which yields true/false,
+		* and yields the values that were buffered while paused.
+		* @example
+		* var pauser = new Rx.Subject();
+		* var source = Rx.Observable.interval(100).pausableBuffered(pauser);
+		* @param pauser The observable sequence used to pause the underlying sequence.
+		* @returns The observable sequence which is paused based upon the pauser.
+		*/
+		pausableBuffered(pauser: Observable<boolean>): Observable<T>;
+
+		/**
+		* Attaches a controller to the observable sequence with the ability to queue.
+		* @example
+		* var source = Rx.Observable.interval(100).controlled();
+		* source.request(3); // Reads 3 values
+		*/
+		controlled(enableQueue?: boolean): ControlledObservable<T>;
+	}
+
+	export interface ControlledObservable<T> extends Observable<T> {
+		request(numberOfItems?: number): IDisposable;
+	}
+}
diff --git a/rx.js/rx.backpressure.d.ts b/rx.js/rx.backpressure.d.ts
index d09aa91e7e..7d7b878fd3 100644
--- a/rx.js/rx.backpressure.d.ts
+++ b/rx.js/rx.backpressure.d.ts
@@ -4,40 +4,4 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 ///<reference path="rx.d.ts" />
-
-declare module Rx {
-	export interface Observable<T> {
-		/**
-		* Pauses the underlying observable sequence based upon the observable sequence which yields true/false.
-		* @example
-		* var pauser = new Rx.Subject();
-		* var source = Rx.Observable.interval(100).pausable(pauser);
-		* @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>;
-
-		/**
-		* Pauses the underlying observable sequence based upon the observable sequence which yields true/false,
-		* and yields the values that were buffered while paused.
-		* @example
-		* var pauser = new Rx.Subject();
-		* var source = Rx.Observable.interval(100).pausableBuffered(pauser);
-		* @param pauser The observable sequence used to pause the underlying sequence.
-		* @returns The observable sequence which is paused based upon the pauser.
-		*/
-		pausableBuffered(pauser: Observable<boolean>): Observable<T>;
-
-		/**
-		* Attaches a controller to the observable sequence with the ability to queue.
-		* @example
-		* var source = Rx.Observable.interval(100).controlled();
-		* source.request(3); // Reads 3 values
-		*/
-		controlled(enableQueue?: boolean): ControlledObservable<T>;
-	}
-
-	export interface ControlledObservable<T> extends Observable<T> {
-		request(numberOfItems?: number): IDisposable;
-	}
-}
+///<reference path="rx.backpressure-lite.ts" />