Travis Scott’s McDonald’s meal is a hit.

Just over a week after launching its collaboration with the Houston rapper, the fast-food chain is running out of some key ingredients tied to the promotion. According to a McDonald’s memo obtained by USA Today, the Travis Scott Meal has become so popular that franchisees are reporting shortages of beef, bacon, slivered onions, and shredded lettuce.

“We’ve created a program that’s so compelling to our customers that it’s stretching our world-class supply chain; and if demand continues at these levels, more restaurants will break supply,” McDonald’s said in the memo.

The $6 meal features a Quarter Pounder with cheese, bacon, and lettuce, a medium order of fries with BBQ sauce, and a Sprite. The promotion will continue through Oct. 4 but, starting Sept. 22, to get the Travis Scott Meal for $6 it will have to be ordered through the McDonald’s app.

https://www.youtube.com/watch?v=8K0lnarZ0oQ

McDonald’s confirmed the supply shortages were due to overwhelming demand. “In fact, it’s been so lit, some of our restaurants have temporarily sold out of some of the ingredients in the meal,” the chain said. “We’re working closely with our suppliers, distributors and franchisees to resupply impacted restaurants as quickly as possible.”

Travis, who has collaborated with Fortnite, General Mills, and Nike in the past, is the first celebrity to get his name on a McDonald’s meal since Michael Jordan and the McJordan burger in 1992. “With the launch of the Travis Scott Meal, we broke records across our social channels,” McDonald’s said in the memo. “Since then, the overwhelmingly positive response has continued, far exceeding even our highest expectations.”

Travis has designed custom apparel for McDonald’s employees, which will continue to arrive at restaurants through Sept. 25. He also launched a line of limited merch, including hoodies, T-shirts, rugs, and even a Chicken McNugget pillow, which have since sold out.

In its statement, McDonald’s said it has “more surprises from Cactus Jack coming soon.”