The capsule according to the invention consists of a capsule body having a side wall and having a base which is integral with the side wall. The capsule comprises a lid that covers the capsule body in order to form a closed chamber, wherein said chamber contains a substance for preparing a beverage. The base can be penetrated by a device arranged outside of the capsule in order to conduct a liquid through the chamber. The capsule body is made of plastic, wherein the base has a penetration area and a reinforcement area. A central area of the base is designed at the penetration area and the reinforcement area is arranged around the penetration area. The reinforcement area is designed as at least one recessed section in the base, said section(s) running substantially in the circumferential direction.