diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Sierra-L431/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/Sierra-L431/hwdef.dat
index 6f941affc5..6c399c81b6 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/Sierra-L431/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Sierra-L431/hwdef.dat
@@ -16,6 +16,9 @@ define HAL_STORAGE_SIZE 800
 STM32_ST_USE_TIMER 15
 define CH_CFG_ST_RESOLUTION 16
 
+# enable watchdog
+define HAL_WATCHDOG_ENABLED_DEFAULT true
+
 # board ID for firmware load
 APJ_BOARD_ID 1050
 
@@ -61,6 +64,9 @@ COMPASS RM3100 SPI:rm3100 false ROTATION_PITCH_180
 PB6 I2C1_SCL I2C1
 PB7 I2C1_SDA I2C1
 
+define HAL_I2C_CLEAR_ON_TIMEOUT 0
+define HAL_I2C_INTERNAL_MASK 1
+
 I2C_ORDER I2C1
 
 # allow for reboot command for faster development