rsync encounters chgrp errors despite --no-g

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http://serverfault.com – I am using rsync to sync a directory to a USB-mounted device. That device automounts with myuser:root ownership. When I rsync my directory (that has myuser:myuser ownership) with -a, I get many of the following errors: rsync: chgrp "filename" failed: Operation not permitted (1) I tried adding --no-g after the -a option (since in this case I don't care about setting the group), but the errors persist. What do I need to do to stop rsync from trying to chgrp everything? (HowTos)