diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/cpn_params/Ottano/Ottano-M5.parm b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/cpn_params/Ottano/Ottano-M5.parm
index 157d983a8b..a800cbac36 100755
--- a/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/cpn_params/Ottano/Ottano-M5.parm
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CarbonixCommon/cpn_params/Ottano/Ottano-M5.parm
@@ -4,7 +4,7 @@ OUT1_MAX 2000
 OUT1_TRIM 1000
 OUT1_FUNCTION 37
 OUT2_FUNCTION 0
-RNGFND_PORT 2
+RNGFND_PORT 3
 RNGFND1_TYPE 8
 RNGFND1_MAX_CM 15800
 RNGFND1_GNDCLEAR 0