diff --git a/src/UnicaenParametre/Form/Categorie/CategorieHydrator.php b/src/UnicaenParametre/Form/Categorie/CategorieHydrator.php
index 2bdb7f5d27875a09b606bf54d88e127bbb49b971..b8c7cc6631ab59d32571786ed2c3681a0c32a330 100644
--- a/src/UnicaenParametre/Form/Categorie/CategorieHydrator.php
+++ b/src/UnicaenParametre/Form/Categorie/CategorieHydrator.php
@@ -11,7 +11,7 @@ class CategorieHydrator implements HydratorInterface {
      * @param Categorie $object
      * @return array|void
      */
-    public function extract($object)
+    public function extract(object $object) : array
     {
         $data = [
             'code' => $object->getCode(),