diff --git a/app/src/main/java/io/legado/app/help/BookHelp.kt b/app/src/main/java/io/legado/app/help/BookHelp.kt
index 742f7d91e..1d125eb8d 100644
--- a/app/src/main/java/io/legado/app/help/BookHelp.kt
+++ b/app/src/main/java/io/legado/app/help/BookHelp.kt
@@ -21,6 +21,7 @@ import kotlin.math.abs
 import kotlin.math.max
 import kotlin.math.min
 
+@Suppress("unused")
 object BookHelp {
     private const val cacheFolderName = "book_cache"
     private const val cacheImageFolderName = "images"