diff --git a/zaqar/notification/notifier.py b/zaqar/notification/notifier.py
index ad0d633ba..4a7d077d0 100644
--- a/zaqar/notification/notifier.py
+++ b/zaqar/notification/notifier.py
@@ -29,11 +29,8 @@ class NotifierDriver(object):
 
     def __init__(self, *args, **kwargs):
         self.subscription_controller = kwargs.get('subscription_controller')
-        try:
-            self.executor = futurist.GreenThreadPoolExecutor()
-        except RuntimeError:
-            # TODO(flwang): Make the max_workers configurable
-            self.executor = futurist.ThreadPoolExecutor(max_workers=10)
+        # TODO(flwang): Make the max_workers configurable
+        self.executor = futurist.ThreadPoolExecutor(max_workers=10)
 
     def post(self, queue_name, messages, client_uuid, project=None):
         """Send messages to the subscribers."""
diff --git a/zaqar/tests/unit/notification/test_notifier.py b/zaqar/tests/unit/notification/test_notifier.py
index 82e512689..fec31a69f 100644
--- a/zaqar/tests/unit/notification/test_notifier.py
+++ b/zaqar/tests/unit/notification/test_notifier.py
@@ -51,6 +51,7 @@ class NotifierTest(testing.TestBase):
         with mock.patch('requests.post') as mock_post:
             self.driver.post('fake_queue', self.messages,
                              self.client_id, self.project)
+            self.driver.executor.shutdown()
             mock_post.assert_has_calls([
                 mock.call(self.subscription[0]['subscriber'],
                           data=json.dumps(self.messages[0]),