diff --git a/openstack/session.py b/openstack/session.py
index 3d3323cc..f3a55e90 100644
--- a/openstack/session.py
+++ b/openstack/session.py
@@ -186,7 +186,8 @@ class Session(_session.Session):
         # However, we do need to know that the project id was
         # previously there, so keep it.
         project_id = self.get_project_id()
-        project_id_location = parts.path.find(project_id)
+        # Domain scope token don't include project id
+        project_id_location = parts.path.find(project_id) if project_id else -1
         if project_id_location > -1:
             usable_path = parts.path[slice(0, project_id_location)]
             needs_project_id = True
diff --git a/openstack/tests/unit/test_session.py b/openstack/tests/unit/test_session.py
index 528fe507..82cdeeca 100644
--- a/openstack/tests/unit/test_session.py
+++ b/openstack/tests/unit/test_session.py
@@ -328,6 +328,27 @@ class TestSession(testtools.TestCase):
         self.assertEqual(result, responses[0])
         self.assertFalse(result.needs_project_id)
 
+    def test__get_endpoint_versions_with_domain_scope(self):
+        # This test covers a common case of services deployed under
+        # subdomains. Additionally, it covers the case of getting endpoint
+        # versions with domain scope token
+        sc_uri = "https://service.cloud.com/identity"
+        versions_uri = "https://service.cloud.com"
+
+        sot = session.Session(None)
+        # Project id is None when domain scope session present
+        sot.get_project_id = mock.Mock(return_value=None)
+
+        responses = [session.Session._Endpoint(versions_uri, "versions")]
+        sot._parse_versions_response = mock.Mock(side_effect=responses)
+
+        result = sot._get_endpoint_versions("type", sc_uri)
+
+        sot._parse_versions_response.assert_called_once_with(versions_uri)
+        self.assertEqual(result, responses[0])
+        self.assertFalse(result.needs_project_id)
+        self.assertIsNone(result.project_id)
+
     def test__parse_version(self):
         sot = session.Session(None)