An electrical connector includes an insulating housing, a shell retained on the insulating housing, a plurality of terminals retained on the mating portion of the insulating housing, and a spacer engaging with the insulating housing. The insulating housing includes a base portion and a mating portion protruding from the base portion, the base portion has a top wall, a bottom wall, a pair of sidewalls connecting with the top wall and bottom wall, a front wall connecting with the mating portion and a rear wall. The front wall of the base portion has a pair of slanted portions formed on two sides of the mating portion, the rear wall of the base portion has a plurality of barriers for retaining the terminals and a pair of flange portions on two sides of the barriers, each flange portion has a groove on an inner side surface to engage with the spacer.