diff --git a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat
index 79e3fc7b6b..ab18a6c71a 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-v2450/hwdef.dat
@@ -209,7 +209,6 @@ define AP_SCRIPTING_ENABLED 0
 
 // SkyViper does not have a second battery....
 define AP_BATT_MONITOR_MAX_INSTANCES 1
-define AP_MAVLINK_BATTERY2_ENABLED 0
 
 # SkyViper doesn't use the Plane landing library:
 define HAL_LANDING_DEEPSTALL_ENABLED 0