diff --git a/libraries/AP_HAL_ChibiOS/hwdef/ARK_RTK_GPS/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/ARK_RTK_GPS/hwdef.dat
index 138ab20ea1..05ed9e1d27 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/ARK_RTK_GPS/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/ARK_RTK_GPS/hwdef.dat
@@ -36,7 +36,7 @@ SERIAL_ORDER USART2 USART1
 PA0 TIM2_CH1 TIM2 GPIO(77) LOW ALARM
 
 # safety LED, active low
-PA1 SAFE_LED OUTPUT HIGH
+PA1 SAFE_LED OUTPUT OPENDRAIN HIGH GPIO(3)
 define SAFE_LED_ON 0
 
 # USART1 for GPS with DMA