diff --git a/GpsTracker/Alerts.h b/GpsTracker/Alerts.h
index 8c7e825..a0edc99 100644
--- a/GpsTracker/Alerts.h
+++ b/GpsTracker/Alerts.h
@@ -2,10 +2,10 @@
 
 #include "Positions.h"
 
-#define ALERT_BATTERY_LEVEL_1				1
-#define ALERT_BATTERY_LEVEL_2				2
-#define ALERT_RTC_TEMPERATURE_FAILURE		3
-#define ALERT_RTC_CLOCK_FAILURE				4
+#define ALERT_BATTERY_LEVEL_1				0
+#define ALERT_BATTERY_LEVEL_2				1
+#define ALERT_RTC_TEMPERATURE_FAILURE		2
+#define ALERT_RTC_CLOCK_FAILURE				3
 
 namespace alerts {