1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 55f3a3e667a9..7599c457abd1 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -757,7 +757,7 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
 
                 if (skb->ip_summed == CHECKSUM_PARTIAL) {
                         gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
-                        gso.csum_start = skb->csum_start - skb_headroom(skb);
+                        gso.csum_start = skb_checksum_start_offset(skb);
                         gso.csum_offset = skb->csum_offset;
                 } /* else everything is zero */