diff --git a/libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat
index 3122176fc0..49c0e02c87 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat
@@ -144,4 +144,7 @@ RAM_RESERVE_START 256
 env ROMFS_UNCOMPRESSED True
 
 # reduce the number of CAN RX Buffer
-define HAL_CAN_RX_QUEUE_SIZE 32
\ No newline at end of file
+define HAL_CAN_RX_QUEUE_SIZE 32
+
+# disable stack checking to reduce flash cost
+define CH_DBG_ENABLE_STACK_CHECK FALSE
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py b/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
index 973b85529a..7c1b0ebdd0 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
@@ -821,12 +821,6 @@ def write_mcu_config(f):
     if env_vars.get('ROMFS_UNCOMPRESSED', False):
         f.write('#define HAL_ROMFS_UNCOMPRESSED\n')
 
-    if 'AP_PERIPH' in env_vars:
-        f.write('''
-#define CH_DBG_ENABLE_STACK_CHECK FALSE
-''')
-
-
 def write_ldscript(fname):
     '''write ldscript.ld for this board'''
     flash_size = get_config('FLASH_USE_MAX_KB', type=int, default=0)