diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index 2878dbfffeb7..41a261355662 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -30,6 +30,8 @@ static int xfrm4_tunnel_check_size(struct sk_buff *skb)
 
 	mtu = dst_mtu(skb_dst(skb));
 	if (skb->len > mtu) {
+		skb->protocol = htons(ETH_P_IP);
+
 		if (skb->sk)
 			xfrm_local_error(skb, mtu);
 		else
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index be033f22a3f3..e15feb7b413d 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -79,6 +79,7 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb)
 
 	if (!skb->ignore_df && skb->len > mtu) {
 		skb->dev = dst->dev;
+		skb->protocol = htons(ETH_P_IPV6);
 
 		if (xfrm6_local_dontfrag(skb))
 			xfrm6_local_rxpmtu(skb, mtu);