MGM Resorts International literally keeps the change when casino players cash out slot machine credits, shorting them by millions of dollars, a new proposed class action in Mississippi federal court alleges.

Slot machine players pay for credits on the machine with cash or a credit card. If a play generates a winning combination, the player’s credits increase. A losing play decreases the credit count.

Sometimes, players decide to stop while they still have credits on the machine. This is where the problem arises, New Orleans resident Leane Scherer says in a lawsuit filed Wednesday in the US District Court for the Southern District of Mississippi.