M Burger fans will want to hear this—the popular Chicago-based chain will give out free burgers with any purchase Wednesday.

The move is to celebrate five years since the company first opened its Huron Street location, but the free burger promotion will be available at any of the chain’s four Chicago locations and their Skokie store.

The free burgers include hamburgers, cheeseburgers, their signature M Burgers and, yes, any burger on their “Secret Menu.”

The first fast-casual burger joint from Lettuce Entertain You, M Burger was born on the wall opposite of Tru, one of Chicago’s top fine dining destinations. The location quickly drew a strong following for high quality burgers, fries and shakes at fast-food prices.