diff --git a/src/vs/code/electron-main/windows.ts b/src/vs/code/electron-main/windows.ts
index 35ff436fe8d219c2d1a050201ae8959324f3ba5a..d92969c10b445ed6ed856b49e2c42ef221555d3e 100644
--- a/src/vs/code/electron-main/windows.ts
+++ b/src/vs/code/electron-main/windows.ts
@@ -242,7 +242,7 @@ export class WindowsManager implements IWindowsMainService {
 
 		// Handle various lifecycle events around windows
 		this.lifecycleService.onBeforeWindowUnload(e => this.onBeforeWindowUnload(e));
-		this.lifecycleService.onBeforeWindowClose(win => this.onBeforeWindowClose(win as ICodeWindow));
+		this.lifecycleService.onBeforeWindowClose(window => this.onBeforeWindowClose(window));
 		this.lifecycleService.onBeforeShutdown(() => this.onBeforeShutdown());
 		this.onWindowsCountChanged(e => {
 			if (e.newCount - e.oldCount > 0) {