diff --git a/ackermann-msgs.spec b/ackermann-msgs.spec
index 48c6cf82674994afcf494a07e7596bf6b9519239..f9f75da1c752eb04840efa8e813884b85c2261e5 100644
--- a/ackermann-msgs.spec
+++ b/ackermann-msgs.spec
@@ -7,6 +7,7 @@
 %global __requires_exclude_from ^/opt/ros/%{ros_distro}/.*$
 
 %define RosPkgName      ackermann-msgs
+%define ros_distro      humble
 
 Name:           ros-%{ros_distro}-%{RosPkgName}
 Version:        2.0.2