diff --git a/src/Markup/Avalonia.Markup.Xaml/MarkupExtensions/BindingExtension.cs b/src/Markup/Avalonia.Markup.Xaml/MarkupExtensions/BindingExtension.cs
index c6705cbb4b..6e8fe1e4c0 100644
--- a/src/Markup/Avalonia.Markup.Xaml/MarkupExtensions/BindingExtension.cs
+++ b/src/Markup/Avalonia.Markup.Xaml/MarkupExtensions/BindingExtension.cs
@@ -43,6 +43,7 @@ namespace Avalonia.Markup.Xaml.MarkupExtensions
                 Mode = Mode,
                 Path = pathInfo.Path,
                 Priority = Priority,
+                Source = Source,
                 RelativeSource = pathInfo.RelativeSource ?? RelativeSource,
                 DefaultAnchor = new WeakReference(GetDefaultAnchor((ITypeDescriptorContext)serviceProvider))
             };