A roof rail assembly for a motor vehicle having an open frame vehicle architecture includes a side air curtain fixedly coupled with a sport tube extending along a longitudinal axis of the motor vehicle. A one way hinge bracket overlaying the side air curtain includes an upper bracket portion coupled to the sport tube via a fastener extending through an orifice in the upper bracket portion, a lower bracket portion depending from a lower edge of the upper bracket portion, and a plurality of aligned openings disposed on the upper bracket portion below the orifice in the upper bracket portion and above the lower edge of the upper bracket portion. The lower bracket portion rotates about a bend line defined by the plurality of aligned openings as the side air curtain deploys from a stowed condition to an inflated condition.