diff --git a/src/Markup/Avalonia.Markup.Xaml.Loader/xamlil.github b/src/Markup/Avalonia.Markup.Xaml.Loader/xamlil.github
index 5e498f8bcc..491de981dd 160000
--- a/src/Markup/Avalonia.Markup.Xaml.Loader/xamlil.github
+++ b/src/Markup/Avalonia.Markup.Xaml.Loader/xamlil.github
@@ -1 +1 @@
-Subproject commit 5e498f8bcca403a34aff5efc825cbb4e12b7fa8e
+Subproject commit 491de981dd4433ee58bc9540e2cd4a5d168f8168
diff --git a/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/StyleIncludeTests.cs b/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/StyleIncludeTests.cs
index d76e51f419..929529e97a 100644
--- a/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/StyleIncludeTests.cs
+++ b/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/StyleIncludeTests.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using Avalonia.Controls;
+using Avalonia.Data;
 using Avalonia.Markup.Xaml.Styling;
 using Avalonia.Markup.Xaml.XamlIl.Runtime;
 using Avalonia.Media;
@@ -15,6 +16,11 @@ namespace Avalonia.Markup.Xaml.UnitTests.Xaml;
 
 public class StyleIncludeTests
 {
+    public StyleIncludeTests()
+    {
+        System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor(typeof(RelativeSource).TypeHandle);
+    }
+
     [Fact]
     public void StyleInclude_Is_Built()
     {