diff --git a/site-modules/profile/files/swh/deploy/worker/swh-worker@.service b/site-modules/profile/files/swh/deploy/worker/swh-worker@.service
index ef55b70e..7472e33e 100644
--- a/site-modules/profile/files/swh/deploy/worker/swh-worker@.service
+++ b/site-modules/profile/files/swh/deploy/worker/swh-worker@.service
@@ -1,24 +1,26 @@
 [Unit]
 Description=Software Heritage Worker (%i)
 After=network.target
 
 [Service]
 User=swhworker
 Group=swhworker
 
 Type=simple
+Environment=SWH_CONFIG_FILENAME=/etc/softwareheritage/%i.yml
+# deprecated (kept for retrocompatibility)
 Environment=SWH_WORKER_INSTANCE=%i
 Environment=CONCURRENCY=10
 Environment=MAX_TASKS_PER_CHILD=5
 Environment=LOGLEVEL=info
 ExecStart=/usr/bin/python3 -m celery worker --app=swh.scheduler.celery_backend.config.app --pool=prefork --events --concurrency=${CONCURRENCY} --maxtasksperchild=${MAX_TASKS_PER_CHILD} -Ofair --loglevel=${LOGLEVEL} --without-gossip --without-mingle --without-heartbeat -n %i.%%h
 
 KillMode=process
 KillSignal=SIGTERM
 TimeoutStopSec=0
 
 Restart=always
 RestartSec=10
 
 [Install]
 WantedBy=multi-user.target
\ No newline at end of file