unable to define clamav-host correctly

In my docker-compose I'm using the following line

command: "--listener :8080 --provider local --basedir /basedir --purge-days 10 --purge-interval 2 --max-upload-size 10000000 --clamav-host nextav --perform-clamav-prescan true"

but when I upload a file I'm getting

2023-12-20T19:51:00.535764246Z [transfer.sh]2023/12/20 19:51:00 dial unix nextav: connect: no such file or directory

I have clamav within the docker-compose

av:
image: mkodockx/docker-clamav:alpine
container_name: nextav
hostname: nextav
restart: unless-stopped
volumes:
- /opt/docker/clamav:/var/lib/clamav
- /var/run/clamav/:/var/run/clamav/

but not sure how to actually link up transfer with clamav as the hostname issue seems to causing me lots of problems.

Thanks