An electrical connector assembly includes: an insulative housing defining a receiving room; an arrangement module assembled on a rear end of the insulative housing and defining a riveting slot on a rear end thereof; a number of contacts retained in the receiving room and exposing to a rear end of the arrangement; a metal case enclosing the insulative housing and the arrangement module and having a riveting arm riveted into the riveting slot to fix the metal case on the insulative housing; and a reinforcing member assembled in the arrangement module and disposed near the riveting slot.