A receptacle connector for mating with a plug connector having a mating tongue and a latch thereof, includes an insulative housing defining a mating slot extending along a longitudinal direction to receive the mating tongue of the plug connector, and an outer metallic shield defining a primary space to receive the housing and a secondary space communicatively beside the primary space to receive the latch of the plug connector. A plurality of contacts are disposed in the housing to mechanically and electrically connect to the mating tongue. An inner metallic shield is attached upon a long side of the housing to separate the primary space and the secondary space from each other in a transverse direction perpendicular to the longitudinal direction.