diff --git a/Quake/sv_main.c b/Quake/sv_main.c
index be520e55..a341f4c1 100644
--- a/Quake/sv_main.c
+++ b/Quake/sv_main.c
@@ -693,7 +693,7 @@ void SVFTE_Ack(client_t *client, int sequence)
 	client->lastacksequence = sequence;
 
 	frame = &client->frames[sequence&(client->numframes-1)];
-	if (frame->sequence >= 0)
+	if (frame->sequence == sequence)
 	{
 		frame->sequence = -1;
 		host_client->ping_times[host_client->num_pings%NUM_PING_TIMES] = qcvm->time - frame->timestamp;