diff --git a/horizon/middleware/operation_log.py b/horizon/middleware/operation_log.py
index bafcce4185..973ed66947 100644
--- a/horizon/middleware/operation_log.py
+++ b/horizon/middleware/operation_log.py
@@ -60,7 +60,7 @@ class OperationLogMiddleware(object):
         _log_option = getattr(settings, "OPERATION_LOG_OPTIONS", {})
         _available_methods = ['POST', 'GET', 'PUT', 'DELETE']
         _methods = _log_option.get("target_methods", ['POST'])
-        _default_format = (
+        self._default_format = (
             "[%(client_ip)s] [%(domain_name)s]"
             " [%(domain_id)s] [%(project_name)s]"
             " [%(project_id)s] [%(user_name)s] [%(user_id)s]"
@@ -69,7 +69,7 @@ class OperationLogMiddleware(object):
         _default_ignored_urls = ['/js/', '/static/', '^/api/']
         self.target_methods = [x for x in _methods if x in _available_methods]
         self.mask_fields = _log_option.get("mask_fields", ['password'])
-        self.format = _log_option.get("format", _default_format)
+        self.format = _log_option.get("format", self._default_format)
         self._logger = logging.getLogger('horizon.operation_log')
 
         ignored_urls = _log_option.get("ignore_urls", _default_ignored_urls)
diff --git a/horizon/test/tests/middleware.py b/horizon/test/tests/middleware.py
index c85a773474..81e4f86981 100644
--- a/horizon/test/tests/middleware.py
+++ b/horizon/test/tests/middleware.py
@@ -196,6 +196,7 @@ class OperationLogMiddlewareTest(test.TestCase):
             self.assertIn(data, logging_str)
 
     @override_settings(OPERATION_LOG_ENABLED=True)
+    @override_settings(OPERATION_LOG_OPTIONS={'target_methods': ['GET']})
     @patch(('horizon.middleware.operation_log.OperationLogMiddleware.'
             'OPERATION_LOG'))
     def test_get_log_format(self, mock_logger):
@@ -210,7 +211,7 @@ class OperationLogMiddlewareTest(test.TestCase):
     def test_get_log_format_no_user(self, mock_logger):
         olm = middleware.OperationLogMiddleware()
         request, _ = self._test_ready_for_get()
-        request.delattr("user")
+        delattr(request, "user")
 
         self.assertIsNone(olm._get_log_format(request))