Grimace and Uncle O’Grimacey are welcoming the Shamrock Shake back to restaurants nationwide on Monday, Feb. 10

McDonald’s is bringing back its beloved Shamrock Shake with the help of an old friend. The minty green milkshake will return to restaurants on Monday, Feb. 10 — and the chain’s Uncle O’Grimacey character is returning after a decades-long hiatus to help kick off the annual “Shamrock Season.”

For those looking to celebrate the day with a non-alcoholic beverage, the Shamrock Shake—a McDonald’s vanilla milkshake with minty syrup and whipped cream—is also a seasonal favorite. You can count on the fast-food chain to bring it back every year,