Food delivery service Caviar is adding another big brand to its list of partner restaurants. Today it will start delivering McDonald’s to offices around New York.

This whole week, Caviar’s quick delivery service, Fastbite, will be serving up McDonald’s sausage McMuffin and hash browns for five bucks. Fastbite promises to deliver meals in 15 minutes or less to hungry workers at lunchtime. This is the second major food chain that Caviar has teamed up with, after Chipotle.

Caviar is a subsidiary of Square, which has been bulking up its restaurant services since acquiring Caviar last August. This year, the company acquired Fastbite and added a point-of-sale interface geared toward bartenders. The partnership with McDonald’s is helping to solidify its position in the fast-food delivery space.

McDonald’s has struggled for the past few years to maintain relevance in a country that is increasingly moving toward healthy and organic eating. Targeting a lunch crowd tethered to their desks could be a good opportunity to get McDonald’s back on people’s radar. The fast-food giant recently made their breakfast menu available all day to the delight of many.