diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CSKY405/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/CSKY405/hwdef.dat
index 97c5818937..88966354d0 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CSKY405/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CSKY405/hwdef.dat
@@ -147,7 +147,6 @@ define HAL_BOARD_TERRAIN_DIRECTORY "/APM/TERRAIN"
 # external compass types
 define ALLOW_ARM_NO_COMPASS
 define HAL_PROBE_EXTERNAL_I2C_COMPASSES
-define HAL_I2C_INTERNAL_MASK 0
 define HAL_COMPASS_AUTO_ROT_DEFAULT 2
 
 # built-in barometer
@@ -179,11 +178,5 @@ include ../include/minimize_fpv_osd.inc
 include ../include/no_bootloader_DFU.inc
 
 define HAL_PARACHUTE_ENABLED 1
-define HAL_SPRAYER_ENABLED 0
-define AP_GRIPPER_ENABLED 0
 define HAL_RUNCAM_ENABLED 0
-define HAL_HOTT_TELEM_ENABLED 0
-define HAL_NMEA_OUTPUT_ENABLED 0
 define HAL_BUTTON_ENABLED 0
-define AP_NOTIFY_OREOLED_ENABLED 0
-define HAL_PICCOLO_CAN_ENABLE 0