diff --git a/src/Microsoft.Net.Http.Server/AuthenticationManager.cs b/src/Microsoft.Net.Http.Server/AuthenticationManager.cs
index 26670dfa48..9be0a01897 100644
--- a/src/Microsoft.Net.Http.Server/AuthenticationManager.cs
+++ b/src/Microsoft.Net.Http.Server/AuthenticationManager.cs
@@ -163,9 +163,7 @@ namespace Microsoft.Net.Http.Server
                 && requestInfo->InfoType == UnsafeNclNativeMethods.HttpApi.HTTP_REQUEST_INFO_TYPE.HttpRequestInfoTypeAuth
                 && requestInfo->pInfo->AuthStatus == UnsafeNclNativeMethods.HttpApi.HTTP_AUTH_STATUS.HttpAuthStatusSuccess)
             {
-#if !ASPNETCORE50
                 return true;
-#endif
             }
             return false;
         }
@@ -176,10 +174,8 @@ namespace Microsoft.Net.Http.Server
                 && requestInfo->InfoType == UnsafeNclNativeMethods.HttpApi.HTTP_REQUEST_INFO_TYPE.HttpRequestInfoTypeAuth
                 && requestInfo->pInfo->AuthStatus == UnsafeNclNativeMethods.HttpApi.HTTP_AUTH_STATUS.HttpAuthStatusSuccess)
             {
-#if !ASPNETCORE50
                 return new WindowsPrincipal(new WindowsIdentity(requestInfo->pInfo->AccessToken,
                     GetAuthTypeFromRequest(requestInfo->pInfo->AuthType).ToString()));
-#endif
             }
             return new ClaimsPrincipal(new ClaimsIdentity()); // Anonymous / !IsAuthenticated
         }
diff --git a/src/Microsoft.Net.Http.Server/project.json b/src/Microsoft.Net.Http.Server/project.json
index 01dab743c5..0b54d7ca45 100644
--- a/src/Microsoft.Net.Http.Server/project.json
+++ b/src/Microsoft.Net.Http.Server/project.json
@@ -33,6 +33,7 @@
                 "System.Security.Claims": "4.0.0-beta-*",
                 "System.Security.Cryptography.X509Certificates": "4.0.0-beta-*",
                 "System.Security.Principal": "4.0.0-beta-*",
+                "System.Security.Principal.Windows": "4.0.0-beta-*",
                 "System.Text.Encoding": "4.0.10-beta-*",
                 "System.Text.Encoding.Extensions": "4.0.10-beta-*",
                 "System.Threading": "4.0.0-beta-*",