diff --git a/app/src/main/java/io/legado/app/help/ReadBookConfig.kt b/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
index abb739682..9288a1c76 100644
--- a/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
+++ b/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
@@ -34,7 +34,7 @@ object ReadBookConfig {
 
     var bg: Drawable? = null
     var bgMeanColor: Int = 0
-    val einkConfig:Config
+    private val einkConfig: Config
 
     init {
         upConfig()