diff --git a/app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderActivity.kt b/app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderActivity.kt
index 0d20ad322..c8f2ae510 100644
--- a/app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderActivity.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderActivity.kt
@@ -331,7 +331,7 @@ class ReaderActivity :
 		}
 		if (uiState.totalPages > 0) {
 			binding.slider.value = uiState.currentPage.toFloat()
-			binding.slider.valueTo = uiState.totalPages.toFloat()
+			binding.slider.valueTo = uiState.totalPages.toFloat() - 1
 			binding.slider.isVisible = true
 		} else {
 			binding.slider.isVisible = false