diff --git a/src/vs/workbench/api/browser/mainThreadDebugService.ts b/src/vs/workbench/api/browser/mainThreadDebugService.ts
index bb89ef0cb6c..41005c20e4e 100644
--- a/src/vs/workbench/api/browser/mainThreadDebugService.ts
+++ b/src/vs/workbench/api/browser/mainThreadDebugService.ts
@@ -4,11 +4,11 @@
  *--------------------------------------------------------------------------------------------*/
 
 import { DisposableStore } from 'vs/base/common/lifecycle';
-import { URI as uri } from 'vs/base/common/uri';
+import { URI as uri, UriComponents } from 'vs/base/common/uri';
 import { IDebugService, IConfig, IDebugConfigurationProvider, IBreakpoint, IFunctionBreakpoint, IBreakpointData, IDebugAdapter, IDebugAdapterDescriptorFactory, IDebugSession, IDebugAdapterFactory, IDataBreakpoint, IDebugSessionOptions } from 'vs/workbench/contrib/debug/common/debug';
 import {
 	ExtHostContext, ExtHostDebugServiceShape, MainThreadDebugServiceShape, DebugSessionUUID, MainContext,
-	IExtHostContext, IBreakpointsDeltaDto, ISourceMultiBreakpointDto, ISourceBreakpointDto, IFunctionBreakpointDto, IDebugSessionDto, IDataBreakpointDto, IStartDebuggingOptions
+	IExtHostContext, IBreakpointsDeltaDto, ISourceMultiBreakpointDto, ISourceBreakpointDto, IFunctionBreakpointDto, IDebugSessionDto, IDataBreakpointDto, IStartDebuggingOptions, IDebugConfiguration
 } from 'vs/workbench/api/common/extHost.protocol';
 import { extHostNamedCustomer } from 'vs/workbench/api/common/extHostCustomers';
 import severity from 'vs/base/common/severity';
@@ -218,15 +218,15 @@ export class MainThreadDebugService implements MainThreadDebugServiceShape, IDeb
 		return undefined;
 	}
 
-	public $startDebugging(options: IStartDebuggingOptions): Promise<boolean> {
-		const folderUri = options.folder ? uri.revive(options.folder) : undefined;
+	public $startDebugging(folder: UriComponents | undefined, nameOrConfig: string | IDebugConfiguration, options: IStartDebuggingOptions): Promise<boolean> {
+		const folderUri = folder ? uri.revive(folder) : undefined;
 		const launch = this.debugService.getConfigurationManager().getLaunch(folderUri);
 		const debugOptions: IDebugSessionOptions = {
 			noDebug: false,
 			parentSession: this.getSession(options.parentSessionID),
 			repl: options.repl
 		};
-		return this.debugService.startDebugging(launch, options.nameOrConfig, debugOptions).then(success => {
+		return this.debugService.startDebugging(launch, nameOrConfig, debugOptions).then(success => {
 			return success;
 		}, err => {
 			return Promise.reject(new Error(err && err.message ? err.message : 'cannot start debugging'));
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 73917119b99..13a74be3332 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -714,8 +714,6 @@ export interface IDebugConfiguration {
 }
 
 export interface IStartDebuggingOptions {
-	folder: UriComponents | undefined;
-	nameOrConfig: string | IDebugConfiguration;
 	parentSessionID?: DebugSessionUUID;
 	repl?: IDebugSessionReplMode;
 }
@@ -730,7 +728,7 @@ export interface MainThreadDebugServiceShape extends IDisposable {
 	$registerDebugAdapterDescriptorFactory(type: string, handle: number): Promise<void>;
 	$unregisterDebugConfigurationProvider(handle: number): void;
 	$unregisterDebugAdapterDescriptorFactory(handle: number): void;
-	$startDebugging(options: IStartDebuggingOptions): Promise<boolean>;
+	$startDebugging(folder: UriComponents | undefined, nameOrConfig: string | IDebugConfiguration, options: IStartDebuggingOptions): Promise<boolean>;
 	$setDebugSessionName(id: DebugSessionUUID, name: string): void;
 	$customDebugAdapterRequest(id: DebugSessionUUID, command: string, args: any): Promise<any>;
 	$appendDebugConsole(value: string): void;
diff --git a/src/vs/workbench/api/node/extHostDebugService.ts b/src/vs/workbench/api/node/extHostDebugService.ts
index d954b28b766..4f91793edfc 100644
--- a/src/vs/workbench/api/node/extHostDebugService.ts
+++ b/src/vs/workbench/api/node/extHostDebugService.ts
@@ -253,9 +253,7 @@ export class ExtHostDebugService implements IExtHostDebugService, ExtHostDebugSe
 	}
 
 	public startDebugging(folder: vscode.WorkspaceFolder | undefined, nameOrConfig: string | vscode.DebugConfiguration, options: vscode.DebugSessionOptions): Promise<boolean> {
-		return this._debugServiceProxy.$startDebugging({
-			folder: folder ? folder.uri : undefined,
-			nameOrConfig,
+		return this._debugServiceProxy.$startDebugging(folder ? folder.uri : undefined, nameOrConfig, {
 			parentSessionID: options.parentSession ? options.parentSession.id : undefined,
 			repl: options.consoleMode === DebugConsoleMode.MergeWithParent ? 'mergeWithParent' : 'separate'
 		});