Abstract: This article is interested in the way Claudel revalorizes the grammar mistake, attributing rhythmic and energetic functions to it. For the poet, syntactic incorrectness is indeed the sign of the primary expressiveness of language. Welcoming the incorrectness enables to translate an energy characteristic of orality, seen as the source of language and poetry. In this sense, Claudel joins a literary primitivism explored by writers such as Nerval, Aragon or Larbaud.