2 files changed, 1 insertions, 3 deletions

diff --git a/src/ext/Util/wixext/UtilExtensionData.cs b/src/ext/Util/wixext/UtilExtensionData.cs
index d3ca3358..c9de2876 100644
--- a/src/ext/Util/wixext/UtilExtensionData.cs
+++ b/src/ext/Util/wixext/UtilExtensionData.cs
@@ -7,8 +7,6 @@ namespace WixToolset.Util
 
     public sealed class UtilExtensionData : BaseExtensionData
     {
-        public override string DefaultCulture => "en-US";
-
         public override bool TryGetSymbolDefinitionByName(string name, out IntermediateSymbolDefinition symbolDefinition)
         {
             symbolDefinition = UtilSymbolDefinitions.ByName(name);
diff --git a/src/ext/Util/wixlib/en-us.wxl b/src/ext/Util/wixlib/en-us.wxl
index fc2db184..b144989e 100644
--- a/src/ext/Util/wixlib/en-us.wxl
+++ b/src/ext/Util/wixlib/en-us.wxl
@@ -1,7 +1,7 @@
 <!-- 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. -->
 
 
-<WixLocalization Culture="en-us" xmlns="http://wixtoolset.org/schemas/v4/wxl">
+<WixLocalization Culture="en-us" ExtensionDefaultCulture="yes" xmlns="http://wixtoolset.org/schemas/v4/wxl">
     <String Id="msierrUSRFailedUserCreate" Overridable="yes" Value="Failed to create user.  ([2]   [3]   [4]   [5])" />
     <String Id="msierrUSRFailedUserCreatePswd" Overridable="yes" Value="Failed to create user due to invalid password.  ([2]   [3]   [4]   [5])" />
     <String Id="msierrUSRFailedUserGroupAdd" Overridable="yes" Value="Failed to add user to group.  ([2]   [3]   [4]   [5])" />