diff --git a/apps/ui/src/electron/windows/main-window.ts b/apps/ui/src/electron/windows/main-window.ts
index 398767de..49ec5e1b 100644
--- a/apps/ui/src/electron/windows/main-window.ts
+++ b/apps/ui/src/electron/windows/main-window.ts
@@ -46,7 +46,8 @@ export function createWindow(): void {
       contextIsolation: true,
       nodeIntegration: false,
     },
-    titleBarStyle: 'hiddenInset',
+    // titleBarStyle is macOS-only; use hiddenInset for native look on macOS
+    ...(process.platform === 'darwin' && { titleBarStyle: 'hiddenInset' as const }),
     backgroundColor: '#0a0a0a',
   };