diff --git a/objets.py b/objets.py
index bd876dc..70417e0 100644
--- a/objets.py
+++ b/objets.py
@@ -655,10 +655,10 @@ class proprio(CransLdapObject):
         self.history_add(login, u"%s %.2f Euros [%s]" % (transaction, abs(diff), comment))
         self["solde"] = new_solde
 
-    def machines(self):
+    def machines(self, mode=None):
         """Renvoie la liste des machines"""
         if self._machines is None:
-            self._machines = self.conn.search(u'mid=*', dn = self.dn, scope = 1, mode=self.mode)
+            self._machines = self.conn.search(u'mid=*', dn = self.dn, scope = 1, mode=self.mode if mode is None else mode)
             for m in self._machines:
                 m._proprio = self
         return self._machines
@@ -706,11 +706,11 @@ class machine(CransLdapObject):
         super(machine, self).__init__(conn, dn, mode, ldif)
         self._proprio = None
 
-    def proprio(self):
+    def proprio(self, mode=None):
         u"""Renvoie le propriétaire de la machine"""
         parent_dn = self.dn.split(',', 1)[1]
         if not self._proprio:
-            self._proprio = new_cransldapobject(self.conn, parent_dn, self.mode)
+            self._proprio = new_cransldapobject(self.conn, parent_dn, self.mode if mode is None else mode)
         return self._proprio
 
     def blacklist_actif(self, excepts=[]):
diff --git a/services.py b/services.py
index 6806dab..f853439 100644
--- a/services.py
+++ b/services.py
@@ -38,7 +38,7 @@ def services_to_args_mail_modif(x):
         return [ "uid=%s" % x.parent['uid'][0] ]
     elif isinstance(x, attributs.Attr) and x.__class__ in [ attributs.exempt ] + services_to_attrs['ports']:
         return [ "mid=%s" % x.parent['mid'][0] ]
-    elif isinstance(x.parent, objets.machine) and isinstance(x.parent.proprio(), objets.AssociationCrans):
+    elif isinstance(x.parent, objets.machine) and isinstance(x.parent.proprio(mode='ro'), objets.AssociationCrans):
         return [ "mid=%s" % x.parent['mid'][0] ]
     else:
         return []
@@ -88,7 +88,7 @@ def services_to_args_del_user(x):
 
 def services_to_args_blacklist(x):
     if isinstance(x.parent, objets.machine):
-        return [ str(ip) for m in x.parent.proprio().machines() for ip in m['ipHostNumber'] ]
+        return [ str(ip) for m in x.parent.proprio(mode='ro').machines() for ip in m['ipHostNumber'] ]
     elif isinstance(x.parent, objets.proprio):
         return [ str(ip) for m in x.parent.machines() for ip in m['ipHostNumber'] ]
     else: