diff --git a/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat
index 63d895bbe7..39d09bf5b6 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat
@@ -210,6 +210,10 @@ PH13 CAN1_TX CAN1
 PB12 CAN2_RX CAN2
 PB13 CAN2_TX CAN2
 
+PH2 GPIO_CAN1_SILENT OUTPUT PUSHPULL SPEED_LOW LOW GPIO(70)
+PH3 GPIO_CAN2_SILENT OUTPUT PUSHPULL SPEED_LOW LOW GPIO(71)
+PH4 GPIO_CAN3_SILENT OUTPUT PUSHPULL SPEED_LOW LOW GPIO(72)
+
 # GPIOs
 PA7 HEATER_EN OUTPUT LOW GPIO(80)
 define HAL_HEATER_GPIO_PIN 80