diff --git a/src/UnicaenParametre/Form/Parametre/ParametreHydrator.php b/src/UnicaenParametre/Form/Parametre/ParametreHydrator.php
index 42b71eddef535afefdffcee1dafe9fc0aacb1b22..04a7ca681c075bd543078f3d94b418293abafbf2 100644
--- a/src/UnicaenParametre/Form/Parametre/ParametreHydrator.php
+++ b/src/UnicaenParametre/Form/Parametre/ParametreHydrator.php
@@ -11,7 +11,7 @@ class ParametreHydrator implements HydratorInterface {
      * @param Parametre $object
      * @return array
      */
-    public function extract($object)
+    public function extract($object) : array
     {
         $data = [
             'code' => $object->getCode(),