[syslog-ng]change directory/file permissions

Hi, I have the following line in syslog-ng.conf: destination router { file("/opt/syslog-ng/var/$YEAR/$MONTH/$YEAR$MONTH$DAY-$HOST" create_dirs(yes) perm(0644)); }; This creates automaticaly the directorys and changes the file-permissions to 644. But it only changes the permissions of the file, not of the directories. What can I do, that also the directories get 644? Regards Stefan