diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8c3d56871b50..5f0043c30b70 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2017,6 +2017,7 @@ static inline size_t rt6_nlmsg_size(void)
 	       + nla_total_size(4) /* RTA_IIF */
 	       + nla_total_size(4) /* RTA_OIF */
 	       + nla_total_size(4) /* RTA_PRIORITY */
+	       + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
 	       + nla_total_size(sizeof(struct rta_cacheinfo));
 }