Some In-N-Out fans are calling for a change.

A petition started by the Good Food Institution has picked up thousands of supporters in just a few days. It’s asking for In-N-Out to start offering a meat-free, vegan patty for its burgers.

The petition says that adding a meat-free option would show that the company truly cares about its customers who want humane and sustainable options. The petition hopes to reach 25,000 supporters to get the popular fast food chain’s attention.

In-N-Out has not yet commented on the effort.