diff --git a/ix.js/ix.d.ts b/ix.js/ix.d.ts
index 2a598dde70..d138b007d5 100644
--- a/ix.js/ix.d.ts
+++ b/ix.js/ix.d.ts
@@ -6,10 +6,6 @@
 
 declare module Ix {
 
-	export interface Comparer<T1, T2> {
-		(item1: T1, item2: T2): number;
-	}
-
 	export interface Observer<T> {
 		onNext? (value: T): void;
 		onError? (error: Error): void;
@@ -113,4 +109,4 @@ declare module Ix {
 		for<T, TResult>(source: Enumerable<T>, resultSelector: EnumerableFunc<T, TResult>): Enumerable<TResult>;
 		forIn<T, TResult>(source: Enumerable<T>, resultSelector: EnumerableFunc<T, TResult>): Enumerable<TResult>;
 	}
-}
\ No newline at end of file
+}