diff --git a/src/Bundle/ChillPersonBundle/Serializer/Normalizer/PersonDocGenNormalizer.php b/src/Bundle/ChillPersonBundle/Serializer/Normalizer/PersonDocGenNormalizer.php
index d6c9e0aac..3f7fd5d9e 100644
--- a/src/Bundle/ChillPersonBundle/Serializer/Normalizer/PersonDocGenNormalizer.php
+++ b/src/Bundle/ChillPersonBundle/Serializer/Normalizer/PersonDocGenNormalizer.php
@@ -87,7 +87,7 @@ class PersonDocGenNormalizer implements
                 )
             ),
             'text' => $this->personRender->renderString($person, []),
-            'age' => $person->getAge(),
+            'age' => (int) $person->getAge(),
             'birthdate' => $this->normalizer->normalize($person->getBirthdate(), $format, $dateContext),
             'deathdate' => $this->normalizer->normalize($person->getDeathdate(), $format, $dateContext),
             'gender' => $this->translator->trans($person->getGender()),