diff --git a/oslo_cache/_opts.py b/oslo_cache/_opts.py
index 95c59382..85b53977 100644
--- a/oslo_cache/_opts.py
+++ b/oslo_cache/_opts.py
@@ -123,10 +123,8 @@ FILE_OPTIONS = {
                     help='Enable the SASL(Simple Authentication and Security'
                          'Layer) if the SASL_enable is true, else disable.'),
         cfg.StrOpt('memcache_username',
-                   default='',
                    help='the user name for the memcached which SASL enabled'),
         cfg.StrOpt('memcache_password',
-                   default='',
                    secret=True,
                    help='the password for the memcached which SASL enabled'),
         cfg.StrOpt('redis_server',