diff --git a/crates/story/src/lib.rs b/crates/story/src/lib.rs
index c13f562f..0dd0f5a6 100644
--- a/crates/story/src/lib.rs
+++ b/crates/story/src/lib.rs
@@ -472,7 +472,7 @@ impl Panel for StoryContainer {
         println!("panel: {} zoomed: {}", self.name, zoomed);
     }
 
-    fn set_active(&self, active: bool, _window: &Window, _cx: &App) {
+    fn set_active(&mut self, active: bool, _window: &Window, _cx: &App) {
         println!("panel: {} active: {}", self.name, active);
     }
 
diff --git a/crates/ui/src/dock/panel.rs b/crates/ui/src/dock/panel.rs
index 2b83e13c..d29d46eb 100644
--- a/crates/ui/src/dock/panel.rs
+++ b/crates/ui/src/dock/panel.rs
@@ -95,8 +95,7 @@ pub trait Panel: EventEmitter<PanelEvent> + Render + Focusable {
     /// This method will be called when the panel is active or inactive.
     ///
     /// The last_active_panel and current_active_panel will be touched when the panel is active.
-    #[allow(unused_variables)]
-    fn set_active(&self, active: bool, window: &Window, cx: &App) {}
+    fn set_active(&mut self, active: bool, window: &Window, cx: &App) {}
 
     /// Set zoomed state of the panel.
     ///