I propose that a quotation appearing in Proclus’ commentary on Plato’s Timaeus, and attributed by Proclus to Parmenides, preserves an independent fragment of Parmenides’ poem. Because the verses quoted share language familiar from other Parmenidean and Empedoclean lines, scholars have regarded Proclus’ quotation as a conflation of lines by Parmenides and Empedocles, but when due allowance is made for the repetitiousness of Parmenides’ poetry and for Empedocles’ borrowings from Parmenides, there is no reason to assume any confusion on Proclus’ part.