The U.S. Department of Labor says a Waikiki tour bus company has been ordered to pay $40,000 in back pay and damages to 22 workers forced to work overtime.

The federal agency says Blue Wave Tours Inc. paid tour bus drivers based on how many trips they work. The agency says the company ignored hours worked beyond a normal 40-hour work week.

Hawaii District Director Terence Trotter says employees must be paid for overtime regardless of whether they’re paid by the trip or by the hour.