An electrical connector includes an insulative housing, a shell covering the insulative housing, and a flange mounted to the shell. The insulative housing has a front face, a number of outer faces, and a receiving cavity extending through the front face for receiving a mating connector. The shell has a front wall and a number of outer walls covering the housing front and outer faces, respectively. The flange has a mating sleeve mounted to the shell and a mating flange portion for engaging a panel along a front-to-back direction. The mating sleeve is bent from a material band, and the mating flange portion is bent from the mating sleeve. The mating flange portion is substantially perpendicular to and resiliently flexible relative to the mating sleeve.