diff --git a/samples/ChatSample/Controllers/ManageController.cs b/samples/ChatSample/Controllers/ManageController.cs
index f7182fa0d2..3437b2d8dc 100644
--- a/samples/ChatSample/Controllers/ManageController.cs
+++ b/samples/ChatSample/Controllers/ManageController.cs
@@ -5,6 +5,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Mvc;