diff --git a/wsme/tests/test_types.py b/wsme/tests/test_types.py
index a5b49bf..50bc286 100644
--- a/wsme/tests/test_types.py
+++ b/wsme/tests/test_types.py
@@ -113,8 +113,11 @@ class TestTypes(unittest.TestCase):
         class Child(Parent):
             child_attribute = int
 
+        types.register_type(Parent)
         types.register_type(Child)
 
+        assert len(Child._wsme_attributes) == 2
+
     def test_selfreftype(self):
         class SelfRefType(object):
             pass