diff --git a/simulation/s1/worker-agent.sh b/simulation/s1/worker-agent.sh
index 98ad809..01be9e1 100755
--- a/simulation/s1/worker-agent.sh
+++ b/simulation/s1/worker-agent.sh
@@ -59,10 +59,12 @@ if [[ ! -f "${ROS_SETUP}" || ! -f "${PX4_MSGS_SETUP}" ]]; then
     exit 2
 fi
 
+set +u
 # shellcheck disable=SC1090
 source "${ROS_SETUP}"
 # shellcheck disable=SC1090
 source "${PX4_MSGS_SETUP}"
+set -u
 
 exec env \
     ROS_DOMAIN_ID=0 \