This article seeks to illustrate the kinds of difficulties that may follow from renouncing a unified approach to restitutionary claims for unjust enrichment. To do so, it draws on the experience of the French legal system, where the notion of unjustified enrichment describes a maxim inspiring various doctrines which have evolved in relative isolation from each other. Relying on this experience, the article argues that the objections recently raised by Nils Jansen against the German law of unjustified enrichment should not lead English lawyers to downplay the value of a unified approach to the subject.