diff --git a/test/E2ETests/Implementation/Validator.cs b/test/E2ETests/Implementation/Validator.cs
index 6e82dacf33..1011b1c6c0 100644
--- a/test/E2ETests/Implementation/Validator.cs
+++ b/test/E2ETests/Implementation/Validator.cs
@@ -8,14 +8,15 @@ using Microsoft.AspNetCore.Server.Testing;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Internal;
 using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Authentication.Cookies;
 using Xunit;
 
 namespace E2ETests
 {
     public partial class Validator
     {
-        private static readonly string IdentityCookieName = new IdentityCookieOptions().ApplicationCookieAuthenticationScheme;
-        private static readonly string ExternalLoginCookieName = new IdentityCookieOptions().ExternalCookieAuthenticationScheme;
+        private static readonly string IdentityCookieName = CookieAuthenticationDefaults.CookiePrefix + new IdentityCookieOptions().ApplicationCookieAuthenticationScheme;
+        private static readonly string ExternalLoginCookieName = CookieAuthenticationDefaults.CookiePrefix + new IdentityCookieOptions().ExternalCookieAuthenticationScheme;
         private HttpClient _httpClient;
 
         private HttpClientHandler _httpClientHandler;
diff --git a/test/E2ETests/project.json b/test/E2ETests/project.json
index 9f0d27bb3d..70cfa26e41 100644
--- a/test/E2ETests/project.json
+++ b/test/E2ETests/project.json
@@ -7,6 +7,7 @@
   ],
   "dependencies": {
     "Microsoft.AspNetCore.Identity": "1.0.0-*",
+    "Microsoft.AspNetCore.Authentication.Cookies": "1.0.0-*",
     "Microsoft.AspNetCore.Authentication.OpenIdConnect": "0.1.0-*",
     "Microsoft.AspNetCore.Server.Testing": "1.0.0-*",
     "Microsoft.AspNetCore.WebUtilities": "1.0.0-*",