A cover adapted to attach to and move along a seatbelt strap to intermittently cover and block the buckle. The back and each side extend down from the top surface with the underside substantially flat to thereby define the cover as wedged-shaped. A pair of tab members are formed at the back, the tab members defining a T-shaped opening at the back. The T-shaped opening is adapted to contain a strap of a seatbelt such that the cover is slidably retained on the strap, as a result, the cover can intermittently cover a buckle of the seat belt, i.e. until moved by a driver. In this manner, a driver intending to unlatch the seatbelt and leave the vehicle must first slide the physically deterring and visibly reminding cover away from the latch, thereby being reminded that a passenger may be in the rear of the vehicle.