diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 32c1a97..23e32c8 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1650,7 +1650,8 @@
 
 		memcpy(skb_put(skb, next_skb_size), next_skb->data, next_skb_size);
 
-		skb->ip_summed = next_skb->ip_summed;
+		if (next_skb->ip_summed == CHECKSUM_PARTIAL)
+			skb->ip_summed = CHECKSUM_PARTIAL;
 
 		if (skb->ip_summed != CHECKSUM_PARTIAL)
 			skb->csum = csum_block_add(skb->csum, next_skb->csum, skb_size);