Abstract: A device for holding bedding neatly in place on a waterbed is disclosed. The device is designed for use with a conventional waterbed having a fluid-filled mattress supported within a frame structure which is lined with waterproof plastic liner for preventing water from leaking out of the waterbed. The device includes a fastener for gripping an edge portion of a bedsheet and a positioning component for positioning the fastener at a location below the top surface of the fluid-filled mattress between the mattress and the waterbed liner. The positioning component is secured to the waterbed's frame structure without piercing the waterproof plastic liner.