diff --git a/app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt b/app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt
index 05399af96..be673d4af 100644
--- a/app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt
+++ b/app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt
@@ -404,7 +404,7 @@ class ReaderViewModel @Inject constructor(
 		val state = getCurrentState().assertNotNull("state") ?: return
 		val chapter = chaptersLoader.peekChapter(state.chapterId).assertNotNull("chapter") ?: return
 		val m = manga.assertNotNull("manga") ?: return
-		val chapterIndex = m.chapters[chapter.branch]?.indexOf(chapter) ?: -1
+		val chapterIndex = m.chapters[chapter.branch]?.indexOfFirst { it.id == chapter.id } ?: -1
 		val newState = ReaderUiState(
 			mangaName = m.toManga().title,
 			branch = chapter.branch,