This article challenges Mark Goodacre's contention that the distribution of editorial fatigue in Matthew and Luke points not only to Markan priority but also to Luke's dependence on Matthew. Goodacre's argument is criticised through questioning the assumptions that Matthew's handling of Q would have been analogous to his handling of Mark and to Luke's handling of Q, as well as the claim that no instances of editorial fatigue can be detected in Matthew's handling of the double tradition. The conclusion is that the argument from editorial fatigue cannot be used to establish that the existence of Q is improbable.