The Egg McMuffin is turning 50, and fans can celebrate with a huge discount. McDonald’s is celebrating the 50th anniversary of the beloved breakfast sandwich, which debuted in 1975, with a special deal on everyone’s breakfast favorite — but only for one day.

You can get a McDonald’s egg McMuffin for $1 – but you’ll have to act fast. On Sunday, March 2, McDonald’s is offering customers a classic egg McMuffin or sausage McMuffin with egg for $1 when they order in the mobile app, according to the fast food chain. No additional purchase is required, but you must be a rewards member.

First introduced in 1999, McDonald’s Bagel Sandwiches—then, an egg plus protein of choice—quickly gained fans for being a comprehensive breakfast on-the-go. According to New York Post, the global fast-food chain took standalone bagels off its breakfast menu in 2020.