1 files changed, 1 insertions, 2 deletions

diff --git a/src/WixToolset.Core/Preprocessor.cs b/src/WixToolset.Core/Preprocessor.cs
index 85b3dab8..23f568a8 100644
--- a/src/WixToolset.Core/Preprocessor.cs
+++ b/src/WixToolset.Core/Preprocessor.cs
@@ -1,9 +1,8 @@
 // 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.
 
-namespace WixToolset
+namespace WixToolset.Core
 {
     using System;
-    using System.Collections;
     using System.Collections.Generic;
     using System.Diagnostics.CodeAnalysis;
     using System.Globalization;