diff --git a/tests/Avalonia.Styling.UnitTests/SelectorTests_Descendent.cs b/tests/Avalonia.Styling.UnitTests/SelectorTests_Descendent.cs
index b4c284e7c9..7cf8c3dd1c 100644
--- a/tests/Avalonia.Styling.UnitTests/SelectorTests_Descendent.cs
+++ b/tests/Avalonia.Styling.UnitTests/SelectorTests_Descendent.cs
@@ -175,6 +175,11 @@ namespace Avalonia.Styling.UnitTests
                 throw new NotImplementedException();
             }
 
+            public void NotifyAttachedToLogicalTree(LogicalTreeAttachmentEventArgs e)
+            {
+                throw new NotImplementedException();
+            }
+
             public void NotifyDetachedFromLogicalTree(LogicalTreeAttachmentEventArgs e)
             {
                 throw new NotImplementedException();