The North Carolina-based doughnut-maker and coffeehouse is commemorating the occasion with a dash of green. All of the chain’s original glazed doughnuts are now “O’riginal” and will be colored with green icing for the holiday. And don’t worry — there is no change to the taste.

Krispy Kreme says the deal will last for one day only. The company released a short video promoting the event.

For more St. Patrick’s Day offers, check out Fortune‘s best restaurant deals roundup.