diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 96c179752823e8f6c8a59f0cac1463faca1d370a..9ad4312a4790f0a7a8a098c2a9650ad358d2b1ea 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1716,8 +1716,11 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
 		}
 
 		/* Ignore very old stuff early */
-		if (!after(sp[used_sacks].end_seq, prior_snd_una))
+		if (!after(sp[used_sacks].end_seq, prior_snd_una)) {
+			if (i == 0)
+				first_sack_index = -1;
 			continue;
+		}
 
 		used_sacks++;
 	}