XForwardedFor is not being set

I am setting the following Docker Labels on my service:

  • traefik.traefik.frontend.whiteList.sourceRange: "1.2.3.4/24,5.6.7.8/32"
  • traefik.traefik.frontend.whiteList.useXForwardedFor: "true"

Logging on to the Traefik Dashboard, the IP's are correctly listed under the details tab, yet "XForwardedFor" is set to False.

Any ideas?