diff --git a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
index c45e212a..1130406a 100644
--- a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
+++ b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
@@ -608,7 +608,7 @@ public class MicroPhotoService extends Service {
                 nextPhotoTime *= 1000;
                 if (nextPhotoTime > ts) {
                     mHeartbeatDuration = duration;
-                    registerHeartbeatTimer((int) ((nextPhotoTime - ts) % duration) + 999);
+                    registerHeartbeatTimer((int) ((nextPhotoTime - ts) % duration));
 
                 } else {
                     mHeartbeatDuration = duration;