An electrical connector includes a front housing having a front configured to be mated with a header connector and a rear having a cavity. The electrical connector includes a conductive insert received in the cavity including end walls and cross walls extending between the end walls. The conductive insert includes channels between the cross walls receiving header ground shields of the header connector. The cross-walls include protrusions extending into the channels each having a mating interface engaging the header ground shields. The conductive insert electrically couples each of the header ground shields of the header connector.