1 files changed, 4 insertions, 0 deletions

diff --git a/src/ext/UI/test/WixToolsetTest.UI/UIExtensionFixture.cs b/src/ext/UI/test/WixToolsetTest.UI/UIExtensionFixture.cs
index ae3a49be..9bc82fcf 100644
--- a/src/ext/UI/test/WixToolsetTest.UI/UIExtensionFixture.cs
+++ b/src/ext/UI/test/WixToolsetTest.UI/UIExtensionFixture.cs
@@ -1,5 +1,9 @@
 // Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
 
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+[assembly: Parallelize(Scope = ExecutionScope.MethodLevel)]
+
 namespace WixToolsetTest.UI
 {
     using System.IO;