diff --git a/src/Windows/Avalonia.Win32.Interop/Wpf/WpfTopLevelImpl.cs b/src/Windows/Avalonia.Win32.Interop/Wpf/WpfTopLevelImpl.cs
index 7798452f10..f698266610 100644
--- a/src/Windows/Avalonia.Win32.Interop/Wpf/WpfTopLevelImpl.cs
+++ b/src/Windows/Avalonia.Win32.Interop/Wpf/WpfTopLevelImpl.cs
@@ -241,6 +241,6 @@ namespace Avalonia.Win32.Interop.Wpf
             return new Vector(src.TransformToDevice.M11, src.TransformToDevice.M22);
         }
 
-        IPopupImpl CreatePopup() => null;
+        public IPopupImpl CreatePopup() => null;
     }
 }