diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 1bcdcbc..78185a4 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -748,7 +748,7 @@
 	ipv6_addr_copy(&bp->saddr, saddr);
 	ipv6_addr_copy(&bp->daddr, daddr);
 	bp->protocol = cpu_to_be32(IPPROTO_TCP);
-	bp->len = cpu_to_be16(nbytes);
+	bp->len = cpu_to_be32(nbytes);
 
 	sg_init_one(&sg, bp, sizeof(*bp));
 	return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));