detail log permissions warning

I'm getting this error in the logs when a COA packet is being processed by the coa-relay server: File /var/log/radius/radacct/detail_coa permissions are 0640 (rw-r-----) not 0660 (rw-rw----)) The configuration for that detail log is: detail detail_coa { permissions = 0660 group = ${security.group} filename = ${radacctdir}/detail_coa escape_filenames = no header = "%t" locking = yes } Is that permission setting possibly being affected by the system umask ? It seems to work, but throws that error regardless.