diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/sitl_params/volanti-headless.parm b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/sitl_params/volanti-headless.parm
index ec2431dbdb..bb9410e530 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/sitl_params/volanti-headless.parm
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/sitl_params/volanti-headless.parm
@@ -58,6 +58,7 @@ RLL_RATE_P,0.141009
 RNGFND1_PIN,0
 RNGFND1_SCALING,40
 RNGFND1_TYPE,1
+@delete SERIAL* # SITL does not need to replicate serial assignments
 @delete SERVO*
 SERVO3_MAX,2000
 SERVO3_MIN,1000
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/sitl_params/volanti-realflight.parm b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/sitl_params/volanti-realflight.parm
index e722d32a2e..a0cbb2b6bd 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/sitl_params/volanti-realflight.parm
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/sitl_params/volanti-realflight.parm
@@ -26,6 +26,7 @@ LOG_REPLAY,0 # causes random crashes on the Cygwin SITL
 RNGFND1_PIN,0
 RNGFND1_SCALING,40
 RNGFND1_TYPE,1
+@delete SERIAL* # SITL does not need to replicate serial assignments
 SERVO7_FUNCTION,21 # RealFlight model uses old servo numbering
 SIM_ARSPD_RATIO,1.6
 SIM_ARSPD2_RATIO,1.6