diff --git a/packages/epub_view/lib/src/ui/epub_view.dart b/packages/epub_view/lib/src/ui/epub_view.dart
index 28ece456..a7eaf55a 100644
--- a/packages/epub_view/lib/src/ui/epub_view.dart
+++ b/packages/epub_view/lib/src/ui/epub_view.dart
@@ -251,7 +251,7 @@ class _EpubViewState extends State<EpubView> {
       trailingEdge: trailingEdge,
       leadingEdge: leadingEdge,
     );
-    final index = posIndex >= _chapterIndexes.last
+    final index = posIndex >= _chapterIndexes.length
         ? _chapterIndexes.length
         : _chapterIndexes.indexWhere((chapterIndex) {
             if (posIndex < chapterIndex) {