This article traces the complement selection properties of the adjective accustomed from the eighteenth century to the present. The adjective has frequently selected sentential complements, but the study illustrates a major change affecting the form of such complements. In the eighteenth century they were regularly of the to infinitive type, but today they are almost as regularly of the to -ing type. Both syntactic and semantic factors are identified in the article as having an impact on the change. The study also compares the pace of the change in British and American English, arguing that incipient change was discernible in both varieties as early as the nineteenth century. It is argued further that, at the present time, the change has been completed more fully in American English than in British English. This conclusion is reached by considering sentences with extraction or filler–gap dependencies. The data in the article come from large electronic corpora.