This study provides evidence that the role of the Obligatory Contour Principle (OCP) in substrate languages is reflected in prosodic systems of contact varieties of French. We have compared two contact varieties: Central African French, a variety of French spoken by L1 speakers of Sango a lexical tone language where the constraint is not respected, and Burundi French, which is spoken by L1 speakers of Kirundi, a lexical tone language where the OCP plays an important role in the distribution of tones. Our data indicate that clashes are permitted in the former, but avoided in the latter.