McDonald’s is adding an even better deal to its popular $5 Meal Deal: cheeseburgers for 50 cents.

For the second year in a row, the fast-food giant is discounting one of its most popular menu items on National Cheeseburger Day. On September 18 only, customers can buy the chain’s famous Double Cheeseburger for 50 cents.

The offer is available to customers using the fast food chain’s smartphone app and is limited to one burger per customer.

Users who open the app will be prompted to take advantage of the National Cheeseburger Day promotion. The discount will be automatically applied at checkout.

McDonald’s announced the deal’s return at the same time it revealed that its $5 Meal Deal would continue through December. The combo, which was launched this summer amid sagging sales, includes a choice of a McDouble or McChicken sandwich, four-piece McNuggets, small fries and a soft drink.

The Golden Arches’ offerings compete with the budget-priced combinations of rival fast food chains such as Taco Bell, Burger King, Wendy’s and Popeyes.

Guests looking to make the most of their meal on National Cheeseburger Day can also score a Jr. Bacon Cheeseburger at Wendy’s, worth 1 cent, with the purchase of any other menu item through the chain’s app or website.

Meanwhile, Burger King is giving away a free cheeseburger to all members of its Royal Perks rewards program who make a purchase of $1 or more.

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