diff --git a/src/vs/base/common/winjs.base.d.ts b/src/vs/base/common/winjs.base.d.ts
index 8e7a1afe3a9..7e3ae270d94 100644
--- a/src/vs/base/common/winjs.base.d.ts
+++ b/src/vs/base/common/winjs.base.d.ts
@@ -33,7 +33,7 @@ export declare class Promise {
 	// commented out to speed up adoption of TPromise
 	// static timeout(delay:number):Promise;
 
-	static wrapError(error: any): Promise;
+	static wrapError(error: Error): Promise;
 	// static is(value: any): value is Thenable<any>;
 	// static addEventListener(type: string, fn: EventCallback): void;
 
@@ -106,7 +106,7 @@ export declare class TPromise<V> {
 	public static wrap<ValueType>(value: Thenable<ValueType>): TPromise<ValueType>;
 	public static wrap<ValueType>(value: ValueType): TPromise<ValueType>;
 
-	public static wrapError<ValueType>(error: any): TPromise<ValueType>;
+	public static wrapError<ValueType>(error: Error): TPromise<ValueType>;
 
 	/**
 	 * @internal
@@ -134,5 +134,5 @@ export declare class PPromise<C, P> extends TPromise<C> {
 	public static join<C, P>(promises: PPromise<C, P>[]): PPromise<C, P[]>;
 	public static join<C, P>(promises: { [n: string]: PPromise<C, P> }): PPromise<{ [n: string]: C }, P>;
 	public static any<C, P>(promises: PPromise<C, P>[]): PPromise<{ key: string; value: PPromise<C, P>; }, P>;
-	public static wrapError<V>(error: any): TPromise<V>;
+	public static wrapError<V>(error: Error): TPromise<V>;
 }