diff --git a/keystone/common/validation/validators.py b/keystone/common/validation/validators.py
index a457417662..48a4a685d9 100644
--- a/keystone/common/validation/validators.py
+++ b/keystone/common/validation/validators.py
@@ -20,7 +20,6 @@ from keystone.i18n import _
 class SchemaValidator(object):
     """Resource reference validator class."""
 
-    validator = None
     validator_org = jsonschema.Draft4Validator
 
     def __init__(self, schema):