diff --git a/etc/quantum/plugins/linuxbridge/linuxbridge_conf.ini b/etc/quantum/plugins/linuxbridge/linuxbridge_conf.ini
index d882c72398..c9fe85c9f8 100644
--- a/etc/quantum/plugins/linuxbridge/linuxbridge_conf.ini
+++ b/etc/quantum/plugins/linuxbridge/linuxbridge_conf.ini
@@ -57,3 +57,7 @@ reconnect_interval = 2
 [AGENT]
 # Agent's polling interval in seconds
 polling_interval = 2
+
+[SECURITYGROUP]
+# Firewall driver for realizing quantum security group function
+firewall_driver = quantum.agent.linux.iptables_firewall.IptablesFirewallDriver