diff --git a/src/Avalonia.Base/Avalonia.Base.csproj b/src/Avalonia.Base/Avalonia.Base.csproj
index 1cb29e4e37..402bc3a099 100644
--- a/src/Avalonia.Base/Avalonia.Base.csproj
+++ b/src/Avalonia.Base/Avalonia.Base.csproj
@@ -21,6 +21,9 @@
   <Import Project="..\..\build\NullableEnable.props" />
   <Import Project="..\..\build\DevAnalyzers.props" />
   <Import Project="..\..\build\SourceGenerators.props" />
+  <ItemGroup>
+    <Compile Include="..\Shared\IsExternalInit.cs" Link="IsExternalInit.cs" />
+  </ItemGroup>
 
   <ItemGroup Label="InternalsVisibleTo">
     <InternalsVisibleTo Include="Avalonia.Base.UnitTests, PublicKey=$(AvaloniaPublicKey)" />
@@ -38,7 +41,7 @@
     <InternalsVisibleTo Include="Avalonia.Win32, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="Avalonia.Web.Blazor, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="Avalonia.Dialogs, PublicKey=$(AvaloniaPublicKey)" />
-    <InternalsVisibleTo Include="Avalonia.Diagnostics, PublicKey=$(AvaloniaPublicKey)"/>
+    <InternalsVisibleTo Include="Avalonia.Diagnostics, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="DynamicProxyGenAssembly2, PublicKey=0024000004800000940000000602000000240000525341310004000001000100c547cac37abd99c8db225ef2f6c8a3602f3b3606cc9891605d02baa56104f4cfc0734aa39b93bf7852f7d9266654753cc297e7d2edfe0bac1cdcf9f717241550e0a7b191195b7667bb4f64bcb8e2121380fd1d9d46ad2d92d2d15605093924cceaf74c4861eff62abf69b9291ed0a340e113be11e6a7d3113e92484cf7045cc7" />
   </ItemGroup>
 
diff --git a/src/Avalonia.Base/IsExternalInit.cs b/src/Avalonia.Base/IsExternalInit.cs
deleted file mode 100644
index c6ddf762ad..0000000000
--- a/src/Avalonia.Base/IsExternalInit.cs
+++ /dev/null
@@ -1,14 +0,0 @@
-using System.Diagnostics;
-using System.Diagnostics.CodeAnalysis;
-
-namespace System.Runtime.CompilerServices
-{
-    /// <summary>
-    ///     Reserved to be used by the compiler for tracking metadata.
-    ///     This class should not be used by developers in source code.
-    /// </summary>
-    [ExcludeFromCodeCoverage, DebuggerNonUserCode]
-    internal static class IsExternalInit
-    {
-    }
-}