diff --git a/gtests/net/packetdrill/run_packet.c b/gtests/net/packetdrill/run_packet.c
index 05c9e4b149cc85dfd6ab8e8fdf9650927d7597ef..86da29d20b801781a2c504c6bba26580e4188981 100644
--- a/gtests/net/packetdrill/run_packet.c
+++ b/gtests/net/packetdrill/run_packet.c
@@ -600,7 +600,7 @@ static int map_inbound_icmp_tcp_packet(
 	struct socket *socket, struct packet *live_packet, char **error)
 {
 	u32 *seq = packet_echoed_tcp_seq(live_packet);
-	bool is_syn = false;
+	bool is_syn = live_packet->tcp->syn;
 	u32 seq_offset = local_seq_script_to_live_offset(socket, is_syn);
 	*seq = htonl(ntohl(*seq) + seq_offset);
 	return STATUS_OK;