diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 801eeec..a64011d 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -542,7 +542,7 @@ static struct nl_mmap_hdr *netlink_mmap_hdr(struct sk_buff *skb)
 	return (struct nl_mmap_hdr *)(skb->head - NL_MMAP_HDRLEN);
 }
 
-void netlink_ring_setup_skb(struct sk_buff *skb, struct sock *sk,
+static void netlink_ring_setup_skb(struct sk_buff *skb, struct sock *sk,
 			    struct netlink_ring *ring, struct nl_mmap_hdr *hdr)
 {
 	unsigned int size;