FAT: utf8 is not recommended IO charset for FAT filesystems, filesystem will be case sensitive!

[Piergiorgio Venuti <piergiorgio@gigasec.org>]

Hi all,
I'm using debian live with default settings, after upgrade to squeeze from lenny the following message appear during boostrap:

FAT: utf8 is not recommended IO charset for FAT filesystems, filesystem will be case sensitive!

in effect the mount output is:

/dev/sda1 on /live/image type vfat (ro,noatime,fmask=0022,dmask=0022,codepage=cp437,iocharset=utf8,shortname=mixed,errors=remount-ro)

but this is a default settings. How can I change this in debian live build process to avoid the above error message?

Regards