diff --git a/neutron_fwaas/db/firewall/v2/firewall_db_v2.py b/neutron_fwaas/db/firewall/v2/firewall_db_v2.py
index b0afb5441..804b8062b 100644
--- a/neutron_fwaas/db/firewall/v2/firewall_db_v2.py
+++ b/neutron_fwaas/db/firewall/v2/firewall_db_v2.py
@@ -856,6 +856,7 @@ class FirewallPluginDb(object):
                 firewall_group_id=firewall_group_id).delete()
         return
 
+    @db_api.CONTEXT_WRITER
     def _get_default_fwg_id(self, context, tenant_id):
         """Returns an id of default firewall group for given tenant or None"""
         default_fwg = model_query.query_with_hooks(