diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
index 9b09e1eb7..d5262249e 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
@@ -320,6 +320,7 @@ class ReadBookActivity : BaseReadBookActivity(),
         upSystemUiVisibility()
         registerReceiver(timeBatteryReceiver, timeBatteryReceiver.filter)
         binding.readView.upTime()
+        screenOffTimerStart()
     }
 
     override fun onPause() {