diff --git a/app/src/main/java/io/legado/app/ui/book/read/page/entities/TextChapter.kt b/app/src/main/java/io/legado/app/ui/book/read/page/entities/TextChapter.kt
index b15e5c7fc..e182cd565 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/page/entities/TextChapter.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/page/entities/TextChapter.kt
@@ -31,8 +31,10 @@ data class TextChapter(
     val effectiveReplaceRules: List<ReplaceRule>?
 ) : LayoutProgressListener {
 
+    @Volatile
     var visibleWidth: Int = 0
         private set
+    @Volatile
     var visibleHeight: Int = 0
         private set