diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 61e5902f068732b10f734c7937c7539d418820d7..af832e7ce80f82a0e74613e88a0abf1e0db627c0 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -657,6 +657,7 @@ static int ipip6_rcv(struct sk_buff *skb)
 		if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
 		    !net_eq(tunnel->net, dev_net(tunnel->dev))))
 			goto out;
+		iph = ip_hdr(skb);
 
 		err = IP_ECN_decapsulate(iph, skb);
 		if (unlikely(err)) {