diff --git a/bsp/src/bsp_h308.c b/bsp/src/bsp_h308.c
index b220536..054de00 100644
--- a/bsp/src/bsp_h308.c
+++ b/bsp/src/bsp_h308.c
@@ -187,7 +187,7 @@ static void H308_HandleAlarm(uint8_t count, uint8_t threshold)
     else if ((H308.Data.lel == 0) && (count == 0))
     {
         alarm_flag          = 0;
-        H308.detection_flag = kH308Alarm;
+        H308.detection_flag = kH308Normal;
     }
 }