diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e93fa62..9d49ed2 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -412,7 +412,7 @@
 	return ndev;
 }
 
-struct inet6_dev * ipv6_find_idev(struct net_device *dev)
+static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 {
 	struct inet6_dev *idev;