diff --git a/templates/proxy/keystone.conf.erb b/templates/proxy/keystone.conf.erb
index 5de07a72..e1442e9f 100644
--- a/templates/proxy/keystone.conf.erb
+++ b/templates/proxy/keystone.conf.erb
@@ -1,7 +1,7 @@
 
 [filter:keystone]
 paste.filter_factory = keystone.middleware.swift_auth:filter_factory
-operator_roles = <%= operator_roles.to_a.join(' ') %>
+operator_roles = <%= operator_roles.to_a.join(', ') %>
 is_admin = <%= is_admin %>
 cache = <%= cache %>