diff --git a/extensions/vscode-api-tests/src/commands.test.ts b/extensions/vscode-api-tests/src/commands.test.ts
index 28d727bc1ca046924ee7b624ec3cad5d16e5d6e1..0d92795d241fdcf437f1f9fce4c89fd08feaee2f 100644
--- a/extensions/vscode-api-tests/src/commands.test.ts
+++ b/extensions/vscode-api-tests/src/commands.test.ts
@@ -56,22 +56,6 @@ suite('commands namespace tests', () => {
 		});
 	});
 
-	test('command with return-value', function () {
-
-		let registration = commands.registerCommand('t1', function () {
-			return new Set<number>().add(1).add(2);
-		});
-
-		return commands.executeCommand('t1', 'start').then(value => {
-			registration.dispose();
-
-			assert.ok(value instanceof Set);
-			assert.equal((<Set<number>>value).size, 2);
-			assert.equal((<Set<number>>value).has(1), true);
-			assert.equal((<Set<number>>value).has(2), true);
-		});
-	});
-
 	test('editorCommand with extra args', function () {
 
 		let args: IArguments;
@@ -150,4 +134,4 @@ suite('commands namespace tests', () => {
 
 		return Promise.all([a, b, c, d]);
 	});
-});
+});
\ No newline at end of file
diff --git a/src/vs/workbench/api/node/extHost.protocol.ts b/src/vs/workbench/api/node/extHost.protocol.ts
index 89e8011b409a9a9eb7dad1b8717743bd3a272489..ea75a41995c5e164359c4bb16790fc7fdb98db0f 100644
--- a/src/vs/workbench/api/node/extHost.protocol.ts
+++ b/src/vs/workbench/api/node/extHost.protocol.ts
@@ -429,7 +429,7 @@ export interface MainThreadWindowShape extends IDisposable {
 // -- extension host
 
 export interface ExtHostCommandsShape {
-	$executeContributedCommand<T>(id: string, ...args: any[]): Thenable<void>;
+	$executeContributedCommand<T>(id: string, ...args: any[]): Thenable<T>;
 	$getContributedCommandHandlerDescriptions(): TPromise<{ [id: string]: string | ICommandHandlerDescription }>;
 }
 
diff --git a/src/vs/workbench/api/node/extHostCommands.ts b/src/vs/workbench/api/node/extHostCommands.ts
index ca82afcef48de13847ff4db9b367920958c3babf..774d71f8e262afbf662b0f49dec7ad3b2d993e5b 100644
--- a/src/vs/workbench/api/node/extHostCommands.ts
+++ b/src/vs/workbench/api/node/extHostCommands.ts
@@ -74,7 +74,7 @@ export class ExtHostCommands implements ExtHostCommandsShape {
 		if (this._commands.has(id)) {
 			// we stay inside the extension host and support
 			// to pass any kind of parameters around
-			return this._executeContributedCommand<T>(id, ...args);
+			return this.$executeContributedCommand<T>(id, ...args);
 
 		} else {
 			// automagically convert some argument types
@@ -96,9 +96,10 @@ export class ExtHostCommands implements ExtHostCommandsShape {
 
 			return this._proxy.$executeCommand<T>(id, args);
 		}
+
 	}
 
-	private _executeContributedCommand<T>(id: string, ...args: any[]): Thenable<T> {
+	$executeContributedCommand<T>(id: string, ...args: any[]): Thenable<T> {
 		let command = this._commands.get(id);
 		if (!command) {
 			return TPromise.wrapError<T>(new Error(`Contributed command '${id}' does not exist.`));
@@ -132,10 +133,6 @@ export class ExtHostCommands implements ExtHostCommandsShape {
 		}
 	}
 
-	$executeContributedCommand<T>(id: string, ...args: any[]): Thenable<void> {
-		return this._executeContributedCommand(id, ...args).then(result => void 0);
-	}
-
 	getCommands(filterUnderscoreCommands: boolean = false): Thenable<string[]> {
 		return this._proxy.$getCommands().then(result => {
 			if (filterUnderscoreCommands) {