diff --git a/src/Bundle/ChillThirdPartyBundle/Serializer/Normalizer/ThirdPartyNormalizer.php b/src/Bundle/ChillThirdPartyBundle/Serializer/Normalizer/ThirdPartyNormalizer.php
index c107d8485..65bc15ba0 100644
--- a/src/Bundle/ChillThirdPartyBundle/Serializer/Normalizer/ThirdPartyNormalizer.php
+++ b/src/Bundle/ChillThirdPartyBundle/Serializer/Normalizer/ThirdPartyNormalizer.php
@@ -62,7 +62,7 @@ class ThirdPartyNormalizer implements NormalizerAwareInterface, NormalizerInterf
             }, $thirdParty->getTypesAndCategories()),
             'profession' => $this->normalizer->normalize($thirdParty->getProfession(), $format, $context),
             'address' => $this->normalizer->normalize($thirdParty->getAddress(), $format, ['address_rendering' => 'short']),
-            'phonenumber' => $thirdParty->getTelephone(),
+            'phonenumber' => $this->normalizer->normalize($thirdParty->getTelephone()),
             'email' => $thirdParty->getEmail(),
             'isChild' => $thirdParty->isChild(),
             'parent' => $this->normalizer->normalize($thirdParty->getParent(), $format, $context),