diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index 3b9927f4..b17a4735 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -60,7 +60,6 @@ public class MpMasterService extends Service {
 
     public Logger logger;
 
-    public final static int MSG_WHAT_SENDING_HB = 40;
     public static final int NOTIFICATION_ID_FOREGROUND_SERVICE = 8466503;
     public static final String ACTION_MSG_BROADCAST = "ACT_MSG_BROADCAST";