diff --git a/os_brick/tests/initiator/connectors/test_rbd.py b/os_brick/tests/initiator/connectors/test_rbd.py
index bbb07fc22..bbda10d0e 100644
--- a/os_brick/tests/initiator/connectors/test_rbd.py
+++ b/os_brick/tests/initiator/connectors/test_rbd.py
@@ -89,8 +89,8 @@ class RBDConnectorTestCase(test_connector.ConnectorTestCase):
             snapshot=None)
 
         # Ensure expected object is returned correctly
-        self.assertTrue(isinstance(device_info['path'],
-                                   linuxrbd.RBDVolumeIOWrapper))
+        self.assertIsInstance(device_info['path'],
+                              linuxrbd.RBDVolumeIOWrapper)
 
     @mock.patch('os_brick.initiator.connectors.rbd.tempfile.mkstemp')
     def test_create_ceph_conf(self, mock_mkstemp):
diff --git a/os_brick/tests/initiator/connectors/test_sheepdog.py b/os_brick/tests/initiator/connectors/test_sheepdog.py
index 72bcad0a4..e2a359ec1 100644
--- a/os_brick/tests/initiator/connectors/test_sheepdog.py
+++ b/os_brick/tests/initiator/connectors/test_sheepdog.py
@@ -59,8 +59,8 @@ class SheepdogConnectorTestCase(test_connector.ConnectorTestCase):
         device_info = sd_connector.connect_volume(self.connection_properties)
 
         # Ensure expected object is returned correctly
-        self.assertTrue(isinstance(device_info['path'],
-                                   linuxsheepdog.SheepdogVolumeIOWrapper))
+        self.assertIsInstance(device_info['path'],
+                              linuxsheepdog.SheepdogVolumeIOWrapper)
 
     @mock.patch.object(linuxsheepdog.SheepdogVolumeIOWrapper, 'close')
     def test_disconnect_volume(self, volume_close):