diff --git a/attributs.py b/attributs.py
index 4239d0d..579c0a0 100644
--- a/attributs.py
+++ b/attributs.py
@@ -282,6 +282,8 @@ class Attr(object):
     def __getattr__(self, name):
         return getattr(self.value, name)
 
+    def __ne__(self, obj):
+        return not self == obj
     def __eq__(self, item):
         if isinstance(item, self.__class__):
             return str(self) == str(item)
diff --git a/objets.py b/objets.py
index 7954a10..bd876dc 100644
--- a/objets.py
+++ b/objets.py
@@ -162,6 +162,8 @@ class CransLdapObject(object):
                     nvals = [nldif[attr][vals.index(v)] for v in vals ]
                     raise EnvironmentError("λv. str(Attr(v)) n'est peut-être pas une projection (ie non idempotente):", attr, nvals, vals)
 
+    def __ne__(self, obj):
+        return not self == obj
     def __eq__(self, obj):
         if isinstance(obj, self.__class__):
             if self.mode in  ['w', 'rw']: