[Docker] No IP in backend in host networking mode

[Kernald]

I have a Docker machine set up to use the host network mode. Here's the docker-compose entry:

hass:
  image: 'homeassistant/home-assistant'
  restart: always
  net: 'host'
  volumes:
    - '/etc/localtime:/etc/localtime:ro'
    - '/srv/hass/config:/config'
  labels:
    - "traefik.backend=hass"
    - "traefik.frontend.rule=Host:home.redacted.net"
    - "traefik.port=8123"

When traefik picks it, the backend's URL is set to http://:8123, the IP is missing. Is there any other solution than skipping this docker machine (traefik.enable=false) and adding it from somewhere else? A missing label I could hint traefik with?