diff --git a/src/browser/services/CoreBrowserService.ts b/src/browser/services/CoreBrowserService.ts
index 9999ceec..8a400ffd 100644
--- a/src/browser/services/CoreBrowserService.ts
+++ b/src/browser/services/CoreBrowserService.ts
@@ -31,8 +31,8 @@ export class CoreBrowserService extends Disposable implements ICoreBrowserServic
     this.register(this.onWindowChange((w) => this._screenDprMonitor.setWindow(w)));
     this.register(forwardEvent(this._screenDprMonitor.onDprChange, this._onDprChange));
 
-    this._textarea.addEventListener("focus", () => (this._isFocused = true));
-    this._textarea.addEventListener("blur", () => (this._isFocused = false));
+    this.register(addDisposableDomListener(this._textarea, 'focus', () => (this._isFocused = true)))
+    this.register(addDisposableDomListener(this._textarea, 'blur',  () => (this._isFocused = false)))
   }
 
   public get window(): Window & typeof globalThis {