diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 366fbba..a710fde 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -924,7 +924,7 @@
 		if (tunnel->parms.iph.daddr && skb_dst(skb))
 			skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
 
-		if (skb->len > mtu) {
+		if (skb->len > mtu && !skb_is_gso(skb)) {
 			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 			ip_rt_put(rt);
 			goto tx_error;