diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index 7d1a794f..7b73c568 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -625,7 +625,7 @@ public class MpMasterService extends Service {
                     }
                 }
 
-                if (zeroPoint + closestTime > currentTimeMs + mMpHeartbeatDuration * 60000) {
+                if (zeroPoint + closestTime * 1000 > currentTimeMs + mMpHeartbeatDuration * 60000) {
                     keepAlive = true;
                     registerHeartbeatTimer(currentTimeMs + timeout * 1000, keepAlive);
                 } else {