diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index b61977db9b7f..91b369bc44f9 100644
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -864,7 +864,7 @@ static struct pernet_operations clusterip_net_ops = {
 	.size = sizeof(struct clusterip_net),
 };
 
-struct notifier_block cip_netdev_notifier = {
+static struct notifier_block cip_netdev_notifier = {
 	.notifier_call = clusterip_netdev_event
 };