diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 256d389..1269cca 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -335,5 +335,6 @@ extern const struct ethnl_request_ops ethnl_linkinfo_request_ops;
 extern const struct ethnl_request_ops ethnl_linkmodes_request_ops;
 
 int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
+int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);
 
 #endif /* _NET_ETHTOOL_NETLINK_H */