The investigations of Fletcher and Owens have documented the breadth of Ammianus’ familiarity with Latin literature; however, neither scholar was able to demonstrate a debt to Pliny the Younger. At the same time Alan Cameron has shown that in the later fourth century the Letters of Pliny enjoyed a certain vogue. The issue of Ammianus’ knowledge of Pliny is discussed by Cameron on two occasions. The evidence he cites inclines him to the duly circumspect view that Ammianus may perhaps have been familiar with Pliny's Letters after all. The aim of the present note is to argue that the grounds which have so far been adduced for entertaining such a possibility would in fact appear to be inadmissible.