Conntrackd-stats.log takes all the /tmp

My router runs out of /tmp space every ~15 days. All the space gets taken by /tmp/log/conntrackd-stats.log. Are there anyway to rotate it?

root@turris:~# df -h
Filesystem Size Used Available Use% Mounted on
/dev/mmcblk0p1 7.3G 2.1G 5.2G 29% /
tmpfs 503.3M 503.3M 0 100% /tmp
tmpfs 512.0K 0 512.0K 0% /dev

root@turris:~# du -sh /tmp/* | grep M
211.6M /tmp/lib
289.1M /tmp/log
root@turris:~# du -sh /tmp/log/* | grep M
287.6M /tmp/log/conntrackd-stats.log
1.0M /tmp/log/messages.1
root@turris:~# du -sh /tmp/lib/* | grep M
211.6M /tmp/lib/pakon.db

Also should /tmp/lib/pakon.db be so big?

Router: Omnia, 3.11.8

Thanks!