diff --git a/creole/var_loader.py b/creole/var_loader.py
index c7b607e..20ce12b 100644
--- a/creole/var_loader.py
+++ b/creole/var_loader.py
@@ -900,9 +900,10 @@ class CreoleConstraint():
                 elif check[0] == 'obligatoire':
                     self.mandatory.append(var)
                 elif check[0] == 'valid_differ' and check[1][0]['type'] == 'eole':
-                    if len(check[1]) != 1:
-                        raise Exception(_(u'valid_differ length should be 1'))
-                    self.consistency.setdefault(var, []).append(('not_equal', check[1][0], check[2]))
+                    consistency = ['not_equal']
+                    consistency.extend(check[1])
+                    consistency.append(check[2])
+                    self.consistency.setdefault(var, []).append(tuple(consistency))
                 elif check[0] == 'valid_networknetmask':
                     if len(check[1]) != 1:
                         raise Exception(_(u'valid_networknetmask length should be 1'))