diff --git a/ROMFS/px4fmu_common/init.d-posix/rcS b/ROMFS/px4fmu_common/init.d-posix/rcS
index 3e8d42c686..e7569139c7 100644
--- a/ROMFS/px4fmu_common/init.d-posix/rcS
+++ b/ROMFS/px4fmu_common/init.d-posix/rcS
@@ -108,9 +108,14 @@ fi
 param set MAV_SYS_ID $((px4_instance+1))
 simulator_tcp_port=$((4560+px4_instance))
 udp_offboard_port_local=$((14580+px4_instance))
-udp_offboard_port_remote=$((14540+px4_instance))
+if [ $px4_instance > 9]
+	udp_offboard_port_remote=14549
+then
+	udp_offboard_port_remote=$((14540+px4_instance))
+fi
 udp_gcs_port_local=$((18570+px4_instance))
 
+
 if [ $AUTOCNF = yes ]
 then
 	param set SYS_AUTOSTART $REQUESTED_AUTOSTART