diff --git a/tox.ini b/tox.ini
index f6f4041d6..7ab9d8f2c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -197,6 +197,7 @@ commands=
 commands=
   ansible-playbook -vv -i {changedir}/{env:INVENTORY} {toxinidir}/infrastructure-playbooks/switch-from-non-containerized-to-containerized-ceph-daemons.yml --extra-vars "\
       ireallymeanit=yes \
+      ceph_stable_release={env:CEPH_STABLE_RELEASE:nautilus} \
       ceph_docker_registry_auth=True \
       ceph_docker_registry_username={env:DOCKER_HUB_USERNAME} \
       ceph_docker_registry_password={env:DOCKER_HUB_PASSWORD} \