diff --git a/heat/engine/clients/os/openstacksdk.py b/heat/engine/clients/os/openstacksdk.py
index a1ad0e2031..56c17b45bf 100644
--- a/heat/engine/clients/os/openstacksdk.py
+++ b/heat/engine/clients/os/openstacksdk.py
@@ -67,7 +67,7 @@ class OpenStackSDKPlugin(client_plugin.ClientPlugin):
         return interfaces
 
     def is_not_found(self, ex):
-        return isinstance(ex, exceptions.ResourceNotFound)
+        return isinstance(ex, exceptions.NotFoundException)
 
     def find_network_segment(self, value):
         return self.client().network.find_segment(value).id
diff --git a/heat/tests/clients/test_sdk_client.py b/heat/tests/clients/test_sdk_client.py
index 45935b13ca..98f40af07e 100644
--- a/heat/tests/clients/test_sdk_client.py
+++ b/heat/tests/clients/test_sdk_client.py
@@ -21,14 +21,23 @@ from heat.tests import utils
 
 
 class OpenStackSDKPluginTest(common.HeatTestCase):
-
     @mock.patch('openstack.connection.Connection')
-    def test_create(self, mock_connection):
+    def setUp(self, mock_connection):
+        super(OpenStackSDKPluginTest, self).setUp()
         context = utils.dummy_context()
-        plugin = context.clients.client_plugin('openstack')
-        client = plugin.client()
+        self.plugin = context.clients.client_plugin('openstack')
+
+    def test_create(self):
+        client = self.plugin.client()
         self.assertIsNotNone(client.network.segments)
 
+    def test_is_not_found(self):
+        self.assertFalse(self.plugin.is_not_found(
+            exceptions.HttpException(http_status=400)))
+        self.assertFalse(self.plugin.is_not_found(Exception))
+        self.assertTrue(self.plugin.is_not_found(
+            exceptions.NotFoundException(http_status=404)))
+
 
 class SegmentConstraintTest(common.HeatTestCase):