diff --git a/core/src/widget/view.rs b/core/src/widget/view.rs
index 7f56faf..3e6bfe5 100644
--- a/core/src/widget/view.rs
+++ b/core/src/widget/view.rs
@@ -11,6 +11,6 @@ pub trait HasWidget {
     type Widget: Widget + ?Sized + Unsize<dyn Widget>;
 }
 
-impl<W: Widget + Unsize<dyn Widget>> HasWidget for WidgetRef<W> {
+impl<W: Widget + Unsize<dyn Widget> + ?Sized> HasWidget for WidgetRef<W> {
     type Widget = W;
 }