diff -r ce0e443174d7 -r 8b8da1adef7d ui/cocoa/MainWindow.h
--- a/ui/cocoa/MainWindow.h	Sat Jun 06 16:53:39 2026 +0200
+++ b/ui/cocoa/MainWindow.h	Sat Jun 06 18:04:54 2026 +0200
@@ -29,7 +29,7 @@
 #import "toolkit.h"
 #import "../ui/window.h"
 
-@interface MainWindow : NSWindow<UiToplevelObject>
+@interface MainWindow : NSWindow<UiToplevelObject, NSWindowDelegate>
 
 @property UiObject *obj;
 @property (strong) NSSplitView *splitview;