diff --git a/crates/story/src/lib.rs b/crates/story/src/lib.rs
index b2e6b782..d9383a0c 100644
--- a/crates/story/src/lib.rs
+++ b/crates/story/src/lib.rs
@@ -468,7 +468,7 @@ impl Panel for StoryContainer {
             .contains(&self.name)
     }
 
-    fn set_zoomed(&self, zoomed: bool, _window: &Window, _cx: &App) {
+    fn set_zoomed(&mut self, zoomed: bool, _window: &mut Window, _cx: &mut App) {
         println!("panel: {} zoomed: {}", self.name, zoomed);
     }
 
diff --git a/crates/ui/src/dock/panel.rs b/crates/ui/src/dock/panel.rs
index 78c72fbe..ebc8fc89 100644
--- a/crates/ui/src/dock/panel.rs
+++ b/crates/ui/src/dock/panel.rs
@@ -102,7 +102,7 @@ pub trait Panel: EventEmitter<PanelEvent> + Render + Focusable {
     /// This method will be called when the panel is zoomed or unzoomed.
     ///
     /// Only current Panel will touch this method.
-    fn set_zoomed(&self, zoomed: bool, window: &Window, cx: &App) {}
+    fn set_zoomed(&mut self, zoomed: bool, window: &mut Window, cx: &mut App) {}
 
     /// The addition popup menu of the panel, default is `None`.
     fn popup_menu(&self, this: PopupMenu, window: &Window, cx: &App) -> PopupMenu {