This article analyzes Pere Gimferrer's Dietari exploring the relation between fictional and autobiographical genres. It shows how the writer subverts generic stratification by defining the characteristics of autobiographical writing. Distinguishing two types of text in the Dietari, "associative", which corresponds to the expectations of the genre, and "dissociative", through which the author challenges established conventions, this analysis focuses on the latter and explains in detail the fictional changes that take place. Finally, this reading proposes Gimferrer's Dietari as a literary space that should be used to question the very notion of the genre of autobiography.