diff --git a/src/browser/tsconfig.json b/src/browser/tsconfig.json
index 38854e26..d8f3a189 100644
--- a/src/browser/tsconfig.json
+++ b/src/browser/tsconfig.json
@@ -7,8 +7,7 @@
     ],
     "outDir": "../../out",
     "types": [
-      "../../node_modules/@types/mocha",
-      "../vs/typings/thenable.d.ts"
+      "../../node_modules/@types/mocha"
     ],
     "baseUrl": "..",
     "paths": {
diff --git a/src/vs/base/common/async.ts b/src/vs/base/common/async.ts
index 20f15f32..c0b2669f 100644
--- a/src/vs/base/common/async.ts
+++ b/src/vs/base/common/async.ts
@@ -124,7 +124,7 @@ export function raceTimeout<T>(promise: Promise<T>, timeout: number, onTimeout?:
 	]);
 }
 
-export function asPromise<T>(callback: () => T | Thenable<T>): Promise<T> {
+export function asPromise<T>(callback: () => T | PromiseLike<T>): Promise<T> {
 	return new Promise<T>((resolve, reject) => {
 		const item = callback();
 		if (isThenable<T>(item)) {
diff --git a/src/vs/typings/thenable.d.ts b/src/vs/typings/thenable.d.ts
deleted file mode 100644
index 73373ead..00000000
--- a/src/vs/typings/thenable.d.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) Microsoft Corporation. All rights reserved.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
-
-/**
- * Thenable is a common denominator between ES6 promises, Q, jquery.Deferred, WinJS.Promise,
- * and others. This API makes no assumption about what promise library is being used which
- * enables reusing existing code without migrating to a specific promise implementation. Still,
- * we recommend the use of native promises which are available in VS Code.
- */
-interface Thenable<T> extends PromiseLike<T> { }