diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 19faebed..7ef45d59 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -2384,6 +2384,9 @@ class Adherent(BaseProprietaire):
         else:
             ftime = max(finConn, thetime)
 
+        if mois >= cotisation.duree_conn_plafond:
+            mois = 12
+
         # Calcul de la nouvelle date de fin d'adhésion.
         curyear = datetime.datetime.now().year
         curmonth = datetime.datetime.now().month