diff --git a/native/Avalonia.Native/src/OSX/WindowBaseImpl.h b/native/Avalonia.Native/src/OSX/WindowBaseImpl.h
index ab0a5fb6a1..1c82e91697 100644
--- a/native/Avalonia.Native/src/OSX/WindowBaseImpl.h
+++ b/native/Avalonia.Native/src/OSX/WindowBaseImpl.h
@@ -109,7 +109,7 @@ protected:
     bool _isModal;
 
 public:
-    WindowBaseImpl* Parent;
+    WindowBaseImpl* Parent = nullptr;
     NSWindow * Window;
     ComPtr<IAvnWindowBaseEvents> BaseEvents;
 };