How to stop cntlm logging each http request to systemd journal?

After installing and configuring cntlm I've notice that there is a huge amount of cntlm http's GET, POST and CONNECT log entries in systemd's journal. It is annoying because it is polluting it and keeping each site I've visited or anything else is accessed like browser plugin's requests.

I know that I can use jounalctl's filters but how do I stop them from being logged in the first place? There is no unit file for cntlm where I can put StandardOutput=null.

Thanks