MANSFIELD, Mass. (AP) — Police in Massachusetts are asking Jimmy Buffett fans attending a concert this weekend to leave behind the homemade toilets.

The post on the Mansfield Police Department’s Facebook page calls on “parrotheads” attending the Saturday concert at the Xfinity Center to leave the “tent toilets” at home. The amphitheater’s parking lots open early so fans can tailgate.

The post is accompanied by photos of improvised toilets made by placing toilet seats over buckets fitted with trash bags. One of these makeshift toilets is mounted to the bumper of a pickup truck.

Police say the lots will have an abundance of toilets and the so-called tent toilets won’t be tolerated.

Police tell the fans: “No one likes to poo in a Porta-Loo, but think of it as an experience to build character.”