diff --git a/product/ERP5Type/Interface/Constraint.py b/product/ERP5Type/Interface/Constraint.py
index cb38bf07615374fe11e2acf0d0dbfeca05b7ada4..78dbd75569f0991bbac3a791c415c33d97f9d72b 100644
--- a/product/ERP5Type/Interface/Constraint.py
+++ b/product/ERP5Type/Interface/Constraint.py
@@ -29,8 +29,7 @@
 """Constraint Interface.
 """
 
-from Interface import Interface
-from Interface import Attribute
+from zope.interface import Interface, Attribute
 
 class Constraint(Interface):
   """ERP5 Constraints are classes that are in charge of checking wether an