diff --git a/objets.py b/objets.py
index daf9e36..3e0615c 100644
--- a/objets.py
+++ b/objets.py
@@ -108,6 +108,13 @@ class CransLdapObject(object):
 
     attribs = []
 
+    def update_attribs(self):
+        """
+        Fonction permettant de mettre à jours attribs, dès que les valeurs
+        des attributs ont été instancié
+        """
+        pass
+
     def __init__(self, conn, dn, mode='ro', uldif=None, lockId=None):
         '''
         Créée une instance d'un objet Crans (machine, adhérent,
@@ -158,6 +165,8 @@ class CransLdapObject(object):
 
         self.mode = mode
 
+        self.update_attribs()
+
         if mode in  ['w', 'rw']:
             # Vérification que `λv. str(Attr(v))` est bien une projection
             # C'est-à-dire que si on str(Attr(str(Attr(v)))) on retombe sur str(Attr(v))
@@ -1261,15 +1270,13 @@ class baseCert(CransLdapObject):
     def __repr__(self):
         return str(self.__class__) + " : xid=" + str(self['xid'][0])
 
-    def __init__(self, *args, **kwargs):
-        super(baseCert, self).__init__(*args, **kwargs)
+    def update_attribs(self):
         if "TLSACert" in self['objectClass']:
             self.attribs.extend(self.tlsa_attribs)
         if 'x509Cert' in self['objectClass']:
             self.attribs.extend(self.x509_attribs)
         if "privateKey" in self['objectClass']:
             self.attribs.extend(self.private_attribs)
-        super(baseCert, self).__init__(*args, **kwargs)
 
     def _check_setitem(self, attr, values):
         """