Island residents have reported missing voucher codes in their latest Red Funnel discount booklets.
A “small batch” of booklets have been out with the missing codes to residents.
Anyone with missing codes is being urged to contact Red Funnel so they can mail out a new booklet.
The ferry company has apologised for the error and any inconvenience caused.
A spokesman for Red Funnel said: “We are aware of a printing error with a small batch of the booklets that have been sent to Island households and apologise for any inconvenience this has caused.
“We ask that any customer who has received a booklet without codes please contact us so that we can mail them a new booklet direct to their home address.”