diff --git a/Tools/ros2/ardupilot_sitl/config/default_params/dds_udp.parm b/Tools/ros2/ardupilot_sitl/config/default_params/dds_udp.parm
index 81c3e69cd9..406d0b13f8 100644
--- a/Tools/ros2/ardupilot_sitl/config/default_params/dds_udp.parm
+++ b/Tools/ros2/ardupilot_sitl/config/default_params/dds_udp.parm
@@ -1,2 +1,2 @@
 DDS_ENABLE 1
-DDS_PORT 2019
+DDS_UDP_PORT 2019