An electrical connector includes a housing located in the front of the electrical connector, a plurality of contacts received in the housing, a plurality of cables connected to the contacts, and a cover assembled on the housing. The housing further includes a base portion, a mating portion frontward extending from the base portion and defining a mating direction, and a fastening portion rearward extending from the base portion. The fastening portion includes a bottom surface defining an inclined plane, and an angle is formed between the horizontal plane and the inclined plane.