diff --git a/libraries/AP_HAL_ChibiOS/hwdef/crazyflie2/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/crazyflie2/hwdef.dat
index 4afd78147b..10086c667a 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/crazyflie2/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/crazyflie2/hwdef.dat
@@ -111,3 +111,5 @@ define HAL_BARO_LPS25H_I2C_ADDR 0x5D
 define HAL_BARO_LPS25H_I2C_IMU_ADDR HAL_INS_MPU60x0_I2C_ADDR
 
 define HAL_COMPASS_DEFAULT HAL_COMPASS_AK8963_MPU9250
+
+define ALLOW_ARM_NO_COMPASS
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-f412/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-f412/hwdef.dat
index ea0bad5354..0cefaccb5c 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/skyviper-f412/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/skyviper-f412/hwdef.dat
@@ -122,6 +122,7 @@ define TOY_MODE_ENABLED ENABLED
 define ARMING_DELAY_SEC 0
 define LAND_START_ALT 700
 define LAND_DETECTOR_ACCEL_MAX 2.0f
+define ALLOW_ARM_NO_COMPASS
 
 define CHIBIOS_ADC_MAVLINK_DEBUG 1