McDonald’s is trying to put the “fry” in your Fridays. 

From now until the end of the year, the fast-food chain is giving away free fries every Friday as long as you spend at least $1 through its mobile app. 

CNN reports McDonald’s has started to focus a lot of attention on its app in an effort to revitalize declining sales and appeal to a younger crowd. 

Business Insider predicts that by 2020 ordering food ahead via a mobile device will account for more than 10% of all sales at what it terms “quick-service restaurants.”