cfssl doesn't use authsign endpoint

Hello.
I am trying to make test internal CA following this guide:
https://blog.cloudflare.com/how-to-build-your-own-public-key-infrastructure/
Unfortunately it doesn't work in point of requesting client certificate.
The command `cfssl gencert -config config_client.json csr_client.json` tries to use the "sign" endpoint, even if the config_client.json defines the auth key. But running cfssl server doesn't expose "sign" endpoint, only "authsign", which is correct.
How can I make `cfssl gencert` to use "authsign" instead of "sign" remote endpoint?