access_log if=$variable does not work on ip range

Hello,

I have am a long time nginx user, yesterday I was in need to log actions taken by several IP's within a nginx cluster across multi sites.
I thought to use the nginx 1.7.0+ access_log if=$variable to log these actions.

map $remote_addr $loggable {
default 0;
192.168.0.0/16 1;
}

access_log /path/to/iprange.log if=$loggable
I have to say it does work for single ip's quite well but it does not capture anything from ip ranges.

Is this the intended behavior?

Bogdan