diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 549a103f..3fdd54c4 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -1976,9 +1976,8 @@ class club(base_proprietaire):
         login = login.lower()
         if not sre.match('^club-', login):
             login = 'club-' + login
-        for l in login:
-            if l not in string.letters + '-': 
-                raise ValueError('Caractère %s interdit dans le login.' % l)
+        if not sre.match('^[a-z0-9]*[a-z]+[a-z0-9-]*$', login):
+            raise ValueError(u'Login incorrect')
         login = preattr(login)[1]
         
         if 'posixAccount' in self._data['objectClass']: