diff --git a/passerelle_imio_extra_fees/models.py b/passerelle_imio_extra_fees/models.py
index fb0a7f4..8402ac2 100644
--- a/passerelle_imio_extra_fees/models.py
+++ b/passerelle_imio_extra_fees/models.py
@@ -36,13 +36,12 @@ class ExtraFees(BaseResource):
     @endpoint(methods=['post'])
     def compute(self, request, **kwargs):
         data = json.loads(request.body)
-
+        max_doc_in_letter = 5
         nb_documents = 0
+        nb_letter = 0
         # Balaie chaque elem du panier.
         for basket_item in data['data']:
-            nb_letter = 0
             postage_fee = Decimal('0.74')
-            max_doc_in_letter = 5
             try:
                 nb_documents += int(basket_item['request_data']['nb_documents'])
                 if Decimal(basket_item['request_data']['country_price']) > postage_fee: