Duck Donuts is treating its most loyal guests with a special perk next week. In celebration of National Coffee Day on Wednesday, September 29, registered Duck Donuts Rewards Members will receive an app reward to enjoy a free medium cold brew or frappe that can be redeemed in-shop or online from September 29 through October 1.

Guests must download and register for the app by Tuesday, September 28 at 11:59 pm EST to take advantage of the offer.

The company keeps the National Coffee Day celebration going with its coffee-inspired lineup, which includes the coffee cake donut, glazed with streusel and powdered sugar, and the limited-time coffee milkshake.

Since opening in 2007 in North Carolina, Duck Donuts has grown to more than 100 locally owned and operated shops across 22 states and two international locations in Dubai, UAE and Riyadh, KSA.