An electrical connector includes an insulative housing including a base portion and mating tongue plate protruding forwardly from the base portion; two contact modules being retained with each other and each including an insulative block, and a row of contacts being insert molded in the insulative housing, and a metal shell enclosing the insulative housing and the contact modules. A receiving space is formed between the shell and the tongue plate. The insulative blocks each defines a front portion inserted in the cavity of the insulative housing for the contact modules being retained with the insulative housing reliably.