WATERVILLE (AP) – People calling the U.S. Postal Service using a toll-free number listed in a rural Maine phone book instead are connected to a sex line.

The incorrect number was published in the latest Somerset County-Moose River Valley edition of the EZ to Use Big Book. Instead of a postal employee, callers are routed to a sexually explicit recording.

According to Edward Kruger, general manager of the EZ to Use Big Book, a typo is to blame. He said about 20,000 phone books were printed with the error.

The phone books are produced by Pennsylvania-based Ogden Directories Inc., which publishes 73 phone directories in eight states.

A Postal Service spokesman said he wasn’t aware of any complaints from the public.