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This article brings three corrections to the reconstruction of the basilica in Fanum according to the text of Vitruvius. A new analysis of Vitruvius’s dimensions for the basilica’s groundplan has revealed that the radius of the tribunal’s segmental arch between the side walls of the pronaus aedis Augusti was larger than what it had been assumed so far. The geometry of the hall’s columns, with parastaticae at the rear, could also have been used as supports for the upper storey, based on an axiom by Euclid. The irritating placing of the pluteus/pluteum between the two storeys of the standard basilica can be traced to an unmarked insertion in the edition of Vitruvius by Caesare Caesariano in 1521.