WASHINGTON (AP) — Wal-Mart Stores will pay $4.8 million in back wages and damages to more than 4,500 employees nationwide for unpaid overtime, the Labor Department said Tuesday.

The company will also pay nearly $464,000 in civil penalties for violating federal overtime laws.

The violations cover current and former managers at Wal-Mart vision centers and certain security personnel at Wal-Mart Discount Stores, Wal-Mart Supercenters, Neighborhood Markets and Sam’s Club warehouses.

The Labor Department said the company improperly considered the workers to be exempt from overtime pay.

A Wal-Mart spokesman, Greg Rossiter, said the company took the allegations seriously when they were first raised in 2007 and immediately corrected the way it classified the employees.