diff --git a/src/vs/platform/workspaces/electron-browser/workspacesService.ts b/src/vs/platform/workspaces/electron-browser/workspacesService.ts
index dc32978d8c2..1e0df308123 100644
--- a/src/vs/platform/workspaces/electron-browser/workspacesService.ts
+++ b/src/vs/platform/workspaces/electron-browser/workspacesService.ts
@@ -28,6 +28,6 @@ export class WorkspacesService implements IWorkspacesService {
 	}
 
 	getWorkspaceIdentifier(configPath: URI): Promise<IWorkspaceIdentifier> {
-		return this.channel.call('getWorkspaceIdentifier', configPath);
+		return this.channel.call('getWorkspaceIdentifier', configPath).then(reviveWorkspaceIdentifier);
 	}
 }