diff --git a/app/src/main/java/io/legado/app/constant/PreferKey.kt b/app/src/main/java/io/legado/app/constant/PreferKey.kt
index b92ad091c..59c10f8e8 100644
--- a/app/src/main/java/io/legado/app/constant/PreferKey.kt
+++ b/app/src/main/java/io/legado/app/constant/PreferKey.kt
@@ -91,6 +91,7 @@ object PreferKey {
     const val cBackground = "colorBackground"
     const val cBBackground = "colorBottomBackground"
     const val bgImage = "backgroundImage"
+    const val bgImageBlurring = "backgroundImageBlurring"
 
     const val cNPrimary = "colorPrimaryNight"
     const val cNAccent = "colorAccentNight"