diff --git a/net/netfilter/xt_length.c b/net/netfilter/xt_length.c
index 1873da3a945a..9fbfad13176f 100644
--- a/net/netfilter/xt_length.c
+++ b/net/netfilter/xt_length.c
@@ -30,8 +30,7 @@ static bool
 length_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_length_info *info = par->matchinfo;
-	const u_int16_t pktlen = ntohs(ipv6_hdr(skb)->payload_len) +
-				 sizeof(struct ipv6hdr);
+	u32 pktlen = skb->len;
 
 	return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
 }