diff --git a/libraries/AP_HAL_ChibiOS/hwdef/RADIX2HD/defaults.parm b/libraries/AP_HAL_ChibiOS/hwdef/RADIX2HD/defaults.parm
index a3dcf5c518..b6cc0c5e93 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/RADIX2HD/defaults.parm
+++ b/libraries/AP_HAL_ChibiOS/hwdef/RADIX2HD/defaults.parm
@@ -9,5 +9,8 @@ SERIAL1_PROTOCOL 42
 # GPS on UART2
 SERIAL2_PROTOCOL 5
 
+# ESC Telemetry on UART4
+SERIAL4_PROTOCOL 16
+
 # 9V regulator switch, ON on boot
 RELAY_DEFAULT 1