Service host-name running with value #<unspecified>

I'm a Guix newbie, and I'm also not making use of Guix Home, so for the time being, I'm forced to build the entire config.scm from scratch. However, what I've noticed while building is that I get this weird log:

shepherd: Service host-name running with value #<unspecified>.

What could this be? I'm pretty sure I've set the value of host in the configuration file.

...
 (host-name "hp")
...