The presence of a door jamb at the southern end of the preserved wall of Senwosret I has never been studied, despite the fact that it is a fairly prominent architectural detail. The position of the associated door made it necessary to extend the supporting wall to the south, well beyond the south-side of the large foundation dismantled by the excavator. Based on the details of this door, built during Senwosret I's reign, and the elevation of the Ptolemaic vestibule, as well as photographs of the excavation of the foundations, it is argued here that the chronology of the building sequence proposed by the excavator must be updated. Guided by the lines carved on the blocks of the foundation, the excavator envisaged a typical Ptolemaic temple plan, but attributed it to the Middle Kingdom. In reality, the foundation is Ptolemaic, just like the superstructure of the monument, now disappeared, that it once supported.