diff --git a/frontend/app_flowy/packages/appflowy_popover/lib/src/popover.dart b/frontend/app_flowy/packages/appflowy_popover/lib/src/popover.dart
index a08787df00..e62d857b3b 100644
--- a/frontend/app_flowy/packages/appflowy_popover/lib/src/popover.dart
+++ b/frontend/app_flowy/packages/appflowy_popover/lib/src/popover.dart
@@ -1,4 +1,3 @@
-import 'dart:async';
 import 'package:appflowy_popover/src/layout.dart';
 import 'package:flutter/material.dart';
 import 'mask.dart';