diff --git a/update-repo.sh b/update-repo.sh
index 0df0554..91cb8f1 100755
--- a/update-repo.sh
+++ b/update-repo.sh
@@ -25,7 +25,7 @@ aports_slug_upstream=${APORTS_SLUG_UPSTREAM:-seqsense/aports-ros-experimental}
 aports_slug=${APORTS_SLUG:-${aports_slug_upstream}}
 ros_distro=${ROS_DISTRO:-noetic}
 distribution_type=${ROS_DISTRIBUTION_TYPE:-ros1}
-export ROS_VERSION=${distribution_type/ros}
+export ROS_VERSION=${distribution_type#ros}
 
 package_list=$(
   if [ -f package.list.${ros_distro} ]; then