diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CubeYellow/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/CubeYellow/hwdef.dat
index 0ca16663de..7e8b5154c4 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CubeYellow/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CubeYellow/hwdef.dat
@@ -1,6 +1,8 @@
 # The CUBE Yellow is a variant of The CUBE Black from ProfiCNC/Hex
 # with a STM32F777 MCU
 
+define HAL_CHIBIOS_ARCH_CUBE 1
+
 # MCU class and specific type
 MCU STM32F7xx STM32F777xx