diff --git a/lc_ldap.py b/lc_ldap.py
index 24a558e..95690cf 100644
--- a/lc_ldap.py
+++ b/lc_ldap.py
@@ -363,8 +363,15 @@ class CransLdapObject(object):
     def __getitem__(self, attr):
         if self.mode in [ 'w', 'rw' ]:
             return [ v for v in self._modifs[attr] ]
-        else:
+        elif self.attrs.has_key(attr):
             return [ v for v in self.attrs[attr] ]
+        elif self.has_key(attr):
+            return []
+        raise KeyError(attr)
+
+    def has_key(self,attr):
+        return attr in self.ofields or attr in self.xfields or\
+            attr in self.ufields or attr in self.mfields
 
     def __setitem__(self, attr, values):
         if self.mode not in ['w', 'rw']:
@@ -596,7 +603,7 @@ class machineCrans(machine):
     ofields = machine.ofields + ['nombrePrises']
 
 class borneWifi(machine):
-    ufields = machine.ufields + ['canal', 'puissane', 'hotspot',
+    ufields = machine.ufields + ['canal', 'puissance', 'hotspot',
                                  'prise', 'positionBorne', 'nvram']
 
 class facture(CransLdapObject):