diff --git a/src/ems.h b/src/ems.h
index 7f26f0ad1..6d18f2374 100644
--- a/src/ems.h
+++ b/src/ems.h
@@ -77,7 +77,7 @@
 #define EMS_TYPE_RC35StatusMessage 0x3E       // is an automatic thermostat broadcast giving us temps
 #define EMS_TYPE_RC35StatusMessage_setpoint 2 // desired temp
 #define EMS_TYPE_RC35Set 0x3D                 // for setting values like temp and mode (Working mode HC1)
-#define EMS_OFFSET_RC35Set_mode 6             // position of thermostat mode
+#define EMS_OFFSET_RC35Set_mode 7             // position of thermostat mode
 #define EMS_OFFSET_RC35Set_temp_day 2         // position of thermostat setpoint temperature for day time
 #define EMS_OFFSET_RC35Set_temp_night 1       // position of thermostat setpoint temperature for night time