Proba’s Cento Vergilianus contains a corruption at line 42, sometimes printed as two half-lines separated by a lacuna (42a–b). Previous attempts to emend the passage based upon the four classical elements have met with limited success. This article argues for a novel reconstruction of the passage based upon the six days of the biblical creation, summarized in reverse. Two possible variants of the reconstruction are presented and evaluated on textual, metrical, compositional and contextual grounds.