diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 6748d4d9489d2d4a059642a1b42478da01e71397..c10a86c86ad5e2003988b7e3b9a3b0f686f77c6e 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3814,7 +3814,8 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 		tcp_process_tlp_ack(sk, ack, flag);
 
 	if (tcp_ack_is_dubious(sk, flag)) {
-		if (!(flag & (FLAG_SND_UNA_ADVANCED | FLAG_NOT_DUP))) {
+		if (!(flag & (FLAG_SND_UNA_ADVANCED |
+			      FLAG_NOT_DUP | FLAG_DSACKING_ACK))) {
 			num_dupack = 1;
 			/* Consider if pure acks were aggregated in tcp_add_backlog() */
 			if (!(flag & FLAG_DATA))