diff --git a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlControlThemeTransformer.cs b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlControlThemeTransformer.cs
index 1338dc7248..51fe58d1c9 100644
--- a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlControlThemeTransformer.cs
+++ b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlControlThemeTransformer.cs
@@ -11,7 +11,8 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
     {
         public IXamlAstNode Transform(AstTransformationContext context, IXamlAstNode node)
         {
-            if (!(node is XamlAstObjectNode on && on.Type.GetClrType().FullName == "Avalonia.Styling.ControlTheme"))
+            if (node is not XamlAstObjectNode on ||
+                !context.GetAvaloniaTypes().ControlTheme.IsAssignableFrom(on.Type.GetClrType()))
                 return node;
 
             // Check if we've already transformed this node.
diff --git a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlDuplicateSettersChecker.cs b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlDuplicateSettersChecker.cs
index 4f92fde3f0..4ab9594cd8 100644
--- a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlDuplicateSettersChecker.cs
+++ b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlDuplicateSettersChecker.cs
@@ -15,8 +15,9 @@ class AvaloniaXamlIlDuplicateSettersChecker : IXamlAstTransformer
             return node;
         }
 
-        var fullName = objectNode.Type.GetClrType().FullName;
-        if (fullName is not ("Avalonia.Styling.Style" or "Avalonia.Styling.ControlTheme"))
+        var nodeType = objectNode.Type.GetClrType();
+        if (!context.GetAvaloniaTypes().Style.IsAssignableFrom(nodeType) &&
+            !context.GetAvaloniaTypes().ControlTheme.IsAssignableFrom(nodeType))
         {
             return node;
         }
diff --git a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlSelectorTransformer.cs b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlSelectorTransformer.cs
index 078e23bc02..edddc5424a 100644
--- a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlSelectorTransformer.cs
+++ b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlSelectorTransformer.cs
@@ -19,7 +19,8 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
     {
         public IXamlAstNode Transform(AstTransformationContext context, IXamlAstNode node)
         {
-            if (!(node is XamlAstObjectNode on && on.Type.GetClrType().FullName == "Avalonia.Styling.Style"))
+            if (node is not XamlAstObjectNode on ||
+                !context.GetAvaloniaTypes().Style.IsAssignableFrom(on.Type.GetClrType()))
                 return node;
 
             var pn = on.Children.OfType<XamlAstXamlPropertyValueNode>()
diff --git a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlWellKnownTypes.cs b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlWellKnownTypes.cs
index 0aa3dda693..c55e116cb3 100644
--- a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlWellKnownTypes.cs
+++ b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlWellKnownTypes.cs
@@ -111,6 +111,8 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
         public IXamlMethod ResourceDictionaryDeferredAdd { get; }
         public IXamlType UriKind { get; }
         public IXamlConstructor UriConstructor { get; }
+        public IXamlType Style { get; }
+        public IXamlType ControlTheme { get; }
 
         public AvaloniaXamlIlWellKnownTypes(TransformerConfiguration cfg)
         {
@@ -248,6 +250,8 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
                     XamlIlTypes.Object));
             UriKind = cfg.TypeSystem.GetType("System.UriKind");
             UriConstructor = Uri.GetConstructor(new List<IXamlType>() { cfg.WellKnownTypes.String, UriKind });
+            Style = cfg.TypeSystem.GetType("Avalonia.Styling.Style");
+            ControlTheme = cfg.TypeSystem.GetType("Avalonia.Styling.ControlTheme");
         }
     }