An adapter (9) designed to connect a wiper blade to a drive arm of a wiping system for a motor vehicle, the adapter (9) extending primarily along a longitudinal axis (X) and comprising at least a body (24) having two sides (26) joined together, at least partially, by a bridge of material (27), a head (23) forming a first longitudinal end of the adapter (9), a rear portion (25) forming a second longitudinal end of the adapter (9) opposite the first longitudinal end with respect to the body (24), a flexible tongue (34) emerging from the body (24) of the adapter (9) and a knob (16) emerging from the flexible tongue (34), this knob (16) being configured to block the adapter (9) in a terminal portion of the drive arm of the wiping system.