Abstract: An extender for the U-shaped striker found on the pivotally opening rear window of a motor vehicle to engage the rear door locking mechanism of the vehicle and maintain the rear window in a partially opened yet securely locked position for ventilation of the interior of the vehicle. The striker extender being U-shaped and pivotally affixed to the striker so that it can easily be moved into a first or parallel position for use and a second or perpendicular position for storage. The striker extender does not have to be removed and is always ready for use and easily placed in the desired position without the need for any tools or special skills. Once the window is locked in the partially opened position, the striker extender cannot be removed from outside the vehicle and therefore unauthorized access to the vehicle's interior is not possible.