diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ba4186e..1f58594 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2989,7 +2989,8 @@
 		swap(gso_skb->truesize, skb->truesize);
 	}
 
-	delta = htonl(oldlen + (skb->tail - skb->transport_header) +
+	delta = htonl(oldlen + (skb_tail_pointer(skb) -
+				skb_transport_header(skb)) +
 		      skb->data_len);
 	th->check = ~csum_fold((__force __wsum)((__force u32)th->check +
 				(__force u32)delta));