diff --git a/src/vs/workbench/contrib/userData/browser/userData.contribution.ts b/src/vs/workbench/contrib/userData/browser/userData.contribution.ts
index d1c64c8f11a88f97a39786ba2cdf39a7b1f93a9d..02c6bdc3797b8df981472e7cd3e99939b99c0dc0 100644
--- a/src/vs/workbench/contrib/userData/browser/userData.contribution.ts
+++ b/src/vs/workbench/contrib/userData/browser/userData.contribution.ts
@@ -25,8 +25,6 @@ import { IEditorService } from 'vs/workbench/services/editor/common/editorServic
 import { ITextFileService } from 'vs/workbench/services/textfile/common/textfiles';
 import { Event } from 'vs/base/common/event';
 import { IHistoryService } from 'vs/workbench/services/history/common/history';
-import { IFileService } from 'vs/platform/files/common/files';
-import { InMemoryFileSystemProvider } from 'vs/workbench/services/userData/common/inMemoryUserDataProvider';
 
 const CONTEXT_SYNC_STATE = new RawContextKey<string>('syncStatus', SyncStatus.Uninitialized);
 
@@ -49,13 +47,11 @@ Registry.as<IConfigurationRegistry>(ConfigurationExtensions.Configuration)
 class UserDataSyncContribution extends Disposable implements IWorkbenchContribution {
 
 	constructor(
-		@IFileService fileService: IFileService,
 		@IConfigurationService private readonly configurationService: IConfigurationService,
 		@IUserDataSyncService private readonly userDataSyncService: IUserDataSyncService,
 		@IUserDataSyncStoreService private readonly userDataSyncStoreService: IUserDataSyncStoreService,
 	) {
 		super();
-		this._register(fileService.registerProvider(USER_DATA_PREVIEW_SCHEME, new InMemoryFileSystemProvider()));
 		this.sync(true);
 		this._register(Event.any<any>(
 			Event.filter(this.configurationService.onDidChangeConfiguration, e => e.affectsConfiguration('userConfiguration.enableSync') && this.configurationService.getValue<boolean>('userConfiguration.enableSync')),
diff --git a/src/vs/platform/userDataSync/common/settingsSync.ts b/src/vs/workbench/services/userData/common/settingsSync.ts
similarity index 98%
rename from src/vs/platform/userDataSync/common/settingsSync.ts
rename to src/vs/workbench/services/userData/common/settingsSync.ts
index ae1174b85831162c04cc123d5693464f2d540000..fee382b9750d00de1eb690ba3baac46c431e0d95 100644
--- a/src/vs/platform/userDataSync/common/settingsSync.ts
+++ b/src/vs/workbench/services/userData/common/settingsSync.ts
@@ -6,7 +6,7 @@
 import { Disposable } from 'vs/base/common/lifecycle';
 import { IFileService, FileSystemProviderErrorCode, FileSystemProviderError, IFileContent } from 'vs/platform/files/common/files';
 import { IStorageService, StorageScope } from 'vs/platform/storage/common/storage';
-import { IUserData, UserDataSyncStoreError, UserDataSyncStoreErrorCode, ISynchroniser, SyncStatus, ISettingsMergeService, IUserDataSyncStoreService, SETTINGS_PREVIEW_RESOURCE as SETTINGS_CONFLICTS_RESOURCE } from 'vs/platform/userDataSync/common/userDataSync';
+import { IUserData, UserDataSyncStoreError, UserDataSyncStoreErrorCode, ISynchroniser, SyncStatus, ISettingsMergeService, IUserDataSyncStoreService, SETTINGS_PREVIEW_RESOURCE } from 'vs/platform/userDataSync/common/userDataSync';
 import { VSBuffer } from 'vs/base/common/buffer';
 import { parse, ParseError } from 'vs/base/common/json';
 import { localize } from 'vs/nls';
@@ -40,7 +40,7 @@ export class SettingsSynchroniser extends Disposable implements ISynchroniser {
 	private _onDidChangeLocal: Emitter<void> = this._register(new Emitter<void>());
 	readonly onDidChangeLocal: Event<void> = this._onDidChangeLocal.event;
 
-	readonly conflicts: URI = SETTINGS_CONFLICTS_RESOURCE;
+	readonly conflicts: URI = SETTINGS_PREVIEW_RESOURCE;
 
 	constructor(
 		@IFileService private readonly fileService: IFileService,
diff --git a/src/vs/platform/userDataSync/common/userDataSyncService.ts b/src/vs/workbench/services/userData/common/userDataSyncService.ts
similarity index 83%
rename from src/vs/platform/userDataSync/common/userDataSyncService.ts
rename to src/vs/workbench/services/userData/common/userDataSyncService.ts
index 287d971a205a1026123b5cd217ae8c47a03107e9..9a048f2678dce88507cd6294c1ae0c242ff37f82 100644
--- a/src/vs/platform/userDataSync/common/userDataSyncService.ts
+++ b/src/vs/workbench/services/userData/common/userDataSyncService.ts
@@ -3,12 +3,14 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import { IUserDataSyncService, SyncStatus, ISynchroniser, IUserDataSyncStoreService } from 'vs/platform/userDataSync/common/userDataSync';
+import { IUserDataSyncService, SyncStatus, ISynchroniser, USER_DATA_PREVIEW_SCHEME, IUserDataSyncStoreService } from 'vs/platform/userDataSync/common/userDataSync';
 import { Disposable } from 'vs/base/common/lifecycle';
+import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
-import { SettingsSynchroniser } from 'vs/platform/userDataSync/common/settingsSync';
+import { SettingsSynchroniser } from 'vs/workbench/services/userData/common/settingsSync';
 import { Emitter, Event } from 'vs/base/common/event';
 import { IFileService } from 'vs/platform/files/common/files';
+import { InMemoryFileSystemProvider } from 'vs/workbench/services/userData/common/inMemoryUserDataProvider';
 import { URI } from 'vs/base/common/uri';
 
 export class UserDataSyncService extends Disposable implements IUserDataSyncService {
@@ -30,6 +32,7 @@ export class UserDataSyncService extends Disposable implements IUserDataSyncServ
 		@IInstantiationService private readonly instantiationService: IInstantiationService,
 	) {
 		super();
+		this._register(fileService.registerProvider(USER_DATA_PREVIEW_SCHEME, new InMemoryFileSystemProvider()));
 		this.synchronisers = [
 			this.instantiationService.createInstance(SettingsSynchroniser)
 		];
@@ -92,3 +95,5 @@ export class UserDataSyncService extends Disposable implements IUserDataSyncServ
 	}
 
 }
+
+registerSingleton(IUserDataSyncService, UserDataSyncService);
diff --git a/src/vs/workbench/workbench.common.main.ts b/src/vs/workbench/workbench.common.main.ts
index a8653dce5098d3cf6b01f7f2cb7bd5086da5ddc5..3b9fd5060ff35333c32bf20c5829deb01c7b8483 100644
--- a/src/vs/workbench/workbench.common.main.ts
+++ b/src/vs/workbench/workbench.common.main.ts
@@ -107,9 +107,8 @@ import { IDownloadService } from 'vs/platform/download/common/download';
 import { DownloadService } from 'vs/platform/download/common/downloadService';
 import { OpenerService } from 'vs/editor/browser/services/openerService';
 import { IOpenerService } from 'vs/platform/opener/common/opener';
-import { IUserDataSyncStoreService, IUserDataSyncService } from 'vs/platform/userDataSync/common/userDataSync';
+import { IUserDataSyncStoreService } from 'vs/platform/userDataSync/common/userDataSync';
 import { UserDataSyncStoreService } from 'vs/platform/userDataSync/common/userDataSyncStoreService';
-import { UserDataSyncService } from 'vs/platform/userDataSync/common/userDataSyncService';
 
 registerSingleton(IExtensionGalleryService, ExtensionGalleryService, true);
 registerSingleton(IContextViewService, ContextViewService, true);
@@ -124,7 +123,6 @@ registerSingleton(IMenuService, MenuService, true);
 registerSingleton(IDownloadService, DownloadService, true);
 registerSingleton(IOpenerService, OpenerService, true);
 registerSingleton(IUserDataSyncStoreService, UserDataSyncStoreService);
-registerSingleton(IUserDataSyncService, UserDataSyncService);
 
 //#endregion