diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CubeSolo/defaults.parm b/libraries/AP_HAL_ChibiOS/hwdef/CubeSolo/defaults.parm
index 014be025e832d..367407fcca1e5 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CubeSolo/defaults.parm
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CubeSolo/defaults.parm
@@ -146,6 +146,8 @@ RTL_ALT,4500
 RTL_CLIMB_MIN,1000
 RTL_SPEED,800
 SERIAL1_BAUD,921
+SERIAL1_PROTOCOL,1
+SERIAL2_PROTOCOL,1
 SERIAL4_BAUD,230
 SERIAL4_PROTOCOL,1
 SERVO1_FUNCTION,33