The break-in resistant roller shutter lift security device made of high-quality plastic is clamped from the inside between the guide rail and the roller shutter slats, making it difficult to lift the roller shutter from the outside. It is not visible from the outside and can be adjusted to fit any guide rail width. A practical side marking allows for correct installation on the roller shutter slats. The roller shutter lift security device is not permanently installed and must be removed before operating the roller shutter. Due to its simple clamping installation, the roller shutter lift security device is also suitable for renters.