diff --git a/src/Servers/Kestrel/test/InMemory.FunctionalTests/HttpsConnectionAdapterTests.cs b/src/Servers/Kestrel/test/InMemory.FunctionalTests/HttpsConnectionAdapterTests.cs
index bda5a2efb9..747c9c3626 100644
--- a/src/Servers/Kestrel/test/InMemory.FunctionalTests/HttpsConnectionAdapterTests.cs
+++ b/src/Servers/Kestrel/test/InMemory.FunctionalTests/HttpsConnectionAdapterTests.cs
@@ -20,6 +20,7 @@ using Microsoft.AspNetCore.Server.Kestrel.Https;
 using Microsoft.AspNetCore.Server.Kestrel.Https.Internal;
 using Microsoft.AspNetCore.Server.Kestrel.InMemory.FunctionalTests.TestTransport;
 using Microsoft.AspNetCore.Testing;
+using Microsoft.AspNetCore.Testing.xunit;
 using Microsoft.Extensions.Logging.Testing;
 using Xunit;
 
@@ -497,6 +498,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.InMemory.FunctionalTests
         }
 
         [Theory]
+        [SkipOnHelix]
         [InlineData(ClientCertificateMode.AllowCertificate)]
         [InlineData(ClientCertificateMode.RequireCertificate)]
         public async Task ValidationFailureRejectsConnection(ClientCertificateMode mode)