Chick-fil-A, famously known for being closed on Sundays, recently announced a modification to its 'No Antibiotic' policy, and it caused quite the stir online.

Chicken sandwich rival, Shake Shack, is jumping on the opportunity by announcing free chicken sandwich Sundays to combat any disappointed fans, emphasizing their chicken's continued 'antibiotic-free' status.

Now, it's not free chicken sandwiches forever, but it is free for every Sunday this April. Here's how to claim yours:

• Simply place a minimum $10 order through a Shake Shack kiosk, app, or website for delivery or pick-up.
• Apply the promo code CHICKENSUNDAY to enjoy a complimentary sandwich.
• Note that only one Chicken Shack can be redeemed per order.

You still have time to redeem this freebie, so be sure to apply the promo code at check out at your nearest Shake Shack on Sunday, April 14th, 21st, and 28th! This deal isn't available at Shake Shacks located in airports, stadiums, museums, and travel plazas.