diff --git a/openerp/addons/test_inherit/models.py b/openerp/addons/test_inherit/models.py
index 0804e122a46..e82540df2b5 100644
--- a/openerp/addons/test_inherit/models.py
+++ b/openerp/addons/test_inherit/models.py
@@ -140,3 +140,7 @@ class Parent2(models.AbstractModel):
 
     def stuff(self):
         return super(Parent2, self).stuff() + 'P2'
+
+    @api.constrains('foo')
+    def _check_foo(self):
+        pass
diff --git a/openerp/addons/test_inherit/tests/test_inherit.py b/openerp/addons/test_inherit/tests/test_inherit.py
index c66539d470b..58bec9356ec 100644
--- a/openerp/addons/test_inherit/tests/test_inherit.py
+++ b/openerp/addons/test_inherit/tests/test_inherit.py
@@ -116,3 +116,7 @@ class TestInherit(common.TransactionCase):
         # check method overriding
         self.assertEqual(parent.stuff(), 'P1P2')
         self.assertEqual(child.stuff(), 'P1P2C1')
+
+        # check properties memoized on model
+        self.assertEqual(len(parent._constraint_methods), 1)
+        self.assertEqual(len(child._constraint_methods), 1)
diff --git a/openerp/models.py b/openerp/models.py
index 4da815ef71b..ee3d38c3a7e 100644
--- a/openerp/models.py
+++ b/openerp/models.py
@@ -782,6 +782,10 @@ class BaseModel(object):
         for (key, _, msg) in cls._sql_constraints:
             cls.pool._sql_error[cls._table + '_' + key] = msg
 
+        # reset properties memoized on cls
+        cls._constraint_methods = BaseModel._constraint_methods
+        cls._onchange_methods = BaseModel._onchange_methods
+
     @property
     def _constraint_methods(self):
         """ Return a list of methods implementing Python constraints. """