diff --git a/lib/model/highlight.dart b/lib/model/highlight.dart
index e0ad48e8d..589ada79e 100644
--- a/lib/model/highlight.dart
+++ b/lib/model/highlight.dart
@@ -1,5 +1,3 @@
-import 'dart:collection';
-
 import 'package:flutter/foundation.dart';
 
 class HighlightInfo extends ChangeNotifier {