(WJW) — McDonald’s is offering free six-piece McNuggets to celebrate 40 years of the menu item.

The free deal is only good on Wednesday, Jan. 18, according to a press release. No purchase is necessary, but customers must use the McDonald’s app to order.

There is a limit of one per customer. App download and registration is required.

According to the McDonald’s website, McNuggets are made with all-white meat chicken, no artificial colors, flavors or preservatives.