diff --git a/nova/tests/api/ec2/test_api.py b/nova/tests/api/ec2/test_api.py
index 924497a802..664532fee5 100644
--- a/nova/tests/api/ec2/test_api.py
+++ b/nova/tests/api/ec2/test_api.py
@@ -96,7 +96,7 @@ class FakeHttplibConnection(object):
         pass
 
 
-class XmlConversionTestCase(test.TestCase):
+class XmlConversionTestCase(test.NoDBTestCase):
     """Unit test api xml conversion."""
     def test_number_conversion(self):
         conv = ec2utils._try_convert
@@ -127,7 +127,7 @@ class XmlConversionTestCase(test.TestCase):
         self.assertEqual(conv(''), '')
 
 
-class Ec2utilsTestCase(test.TestCase):
+class Ec2utilsTestCase(test.NoDBTestCase):
     def test_ec2_id_to_id(self):
         self.assertEqual(ec2utils.ec2_id_to_id('i-0000001e'), 30)
         self.assertEqual(ec2utils.ec2_id_to_id('ami-1d'), 29)
diff --git a/nova/tests/api/ec2/test_cloud.py b/nova/tests/api/ec2/test_cloud.py
index 0b05f1145a..0fb9b018c1 100644
--- a/nova/tests/api/ec2/test_cloud.py
+++ b/nova/tests/api/ec2/test_cloud.py
@@ -3098,7 +3098,7 @@ class CloudTestCase(test.TestCase):
             mock_ec2_vol_id_to_uuid.assert_called_once_with(ec2_volume_id)
 
 
-class CloudTestCaseNeutronProxy(test.TestCase):
+class CloudTestCaseNeutronProxy(test.NoDBTestCase):
     def setUp(self):
         super(CloudTestCaseNeutronProxy, self).setUp()
         cfg.CONF.set_override('security_group_api', 'neutron')
diff --git a/nova/tests/api/ec2/test_ec2_validate.py b/nova/tests/api/ec2/test_ec2_validate.py
index 2af1b4fade..61861e6b57 100644
--- a/nova/tests/api/ec2/test_ec2_validate.py
+++ b/nova/tests/api/ec2/test_ec2_validate.py
@@ -181,7 +181,7 @@ class EC2ValidateTestCase(test.TestCase):
                               volume_id=ec2_id)
 
 
-class EC2TimestampValidationTestCase(test.TestCase):
+class EC2TimestampValidationTestCase(test.NoDBTestCase):
     """Test case for EC2 request timestamp validation."""
 
     def test_validate_ec2_timestamp_valid(self):