diff --git a/flutter/lib/utils/multi_window_manager.dart b/flutter/lib/utils/multi_window_manager.dart
index bea110dab..4da0dca7f 100644
--- a/flutter/lib/utils/multi_window_manager.dart
+++ b/flutter/lib/utils/multi_window_manager.dart
@@ -1,4 +1,5 @@
 import 'dart:convert';
+import 'dart:ui';
 
 import 'package:desktop_multi_window/desktop_multi_window.dart';
 import 'package:flutter/services.dart';