diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekF405/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekF405/hwdef.dat
index fcc4527e63..34960d536c 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MatekF405/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekF405/hwdef.dat
@@ -9,8 +9,6 @@
 # MCU class and specific type
 MCU STM32F4xx STM32F405xx
 
-define CONFIG_HAL_BOARD_SUBTYPE HAL_BOARD_SUBTYPE_CHIBIOS_MATEKF405
-
 # board ID for firmware load
 APJ_BOARD_ID 125