diff --git a/src/vs/workbench/test/node/api/extHostWorkspace.test.ts b/src/vs/workbench/test/node/api/extHostWorkspace.test.ts
index a6aee8f4070ef773a0ca711ba3193ec732dd576d..90636dba98469488608627e821ebb753464e8329 100644
--- a/src/vs/workbench/test/node/api/extHostWorkspace.test.ts
+++ b/src/vs/workbench/test/node/api/extHostWorkspace.test.ts
@@ -5,22 +5,31 @@
 
 'use strict';
 
+import { isWindows } from 'vs/base/common/platform';
 import * as assert from 'assert';
 import { ExtHostWorkspace } from 'vs/workbench/api/node/extHostWorkspace';
 import { TestThreadService } from './testThreadService';
 
 suite('ExtHostWorkspace', function () {
 
+	function fsPath(path: string): string {
+		if (isWindows) {
+			return path.replace(/\//g, '\\');
+		} else {
+			return path;
+		}
+	}
+
 	test('asRelativePath', function () {
 
 		const ws = new ExtHostWorkspace(new TestThreadService(), '/Coding/Applications/NewsWoWBot');
 
-		assert.equal(ws.getRelativePath('/Coding/Applications/NewsWoWBot/bernd/das/brot'), 'bernd/das/brot');
+		assert.equal(ws.getRelativePath('/Coding/Applications/NewsWoWBot/bernd/das/brot'), fsPath('bernd/das/brot'));
 		assert.equal(ws.getRelativePath('/Apps/DartPubCache/hosted/pub.dartlang.org/convert-2.0.1/lib/src/hex.dart'),
-			'/Apps/DartPubCache/hosted/pub.dartlang.org/convert-2.0.1/lib/src/hex.dart');
+			fsPath('/Apps/DartPubCache/hosted/pub.dartlang.org/convert-2.0.1/lib/src/hex.dart'));
 
 		assert.equal(ws.getRelativePath(''), '');
-		assert.equal(ws.getRelativePath('/foo/bar'), '/foo/bar');
+		assert.equal(ws.getRelativePath('/foo/bar'), fsPath('/foo/bar'));
 	});
 
 	test('asRelativePath, same paths, #11402', function () {
@@ -28,7 +37,7 @@ suite('ExtHostWorkspace', function () {
 		const input = '/home/aeschli/workspaces/samples/docker';
 		const ws = new ExtHostWorkspace(new TestThreadService(), root);
 
-		assert.equal(ws.getRelativePath(input), input);
+		assert.equal(ws.getRelativePath(input), fsPath(input));
 
 		const input2 = '/home/aeschli/workspaces/samples/docker/a.file';
 		assert.equal(ws.getRelativePath(input2), 'a.file');