diff --git a/gestion/dialog/machine.py b/gestion/dialog/machine.py
index 9c1d859c..56dc85d5 100644
--- a/gestion/dialog/machine.py
+++ b/gestion/dialog/machine.py
@@ -91,7 +91,7 @@ class Dialog(certificat.Dialog, blacklist.Dialog):
         def modif_machine(machine, attrs):
             with self.conn.search(dn=machine.dn, scope=0, mode='rw')[0] as machine:
                 for (key, values) in attrs.items():
-                    if values!=u'<automatique>':
+                    if values!=u'<automatique>' or key != 'ipHostNumber':
                         machine[key]=values
                 machine.validate_changes()
                 machine.history_gen()
@@ -108,7 +108,7 @@ class Dialog(certificat.Dialog, blacklist.Dialog):
             }
             with self.conn.newMachine(proprio.dn, realm, ldif) as machine:
                 for (key, values) in attrs.items():
-                    if values!=u'<automatique>':
+                    if values!=u'<automatique>' or key != u'ipHostNumber':
                         machine[key]=values
                 if attributs.ipsec in machine.attribs:
                     machine[attributs.ipsec.ldap_name]=attributs.ipsec.default