diff --git a/net/batman-adv/tp_meter.c b/net/batman-adv/tp_meter.c
index beabc264a4f1..9ecbc6023cfc 100644
--- a/net/batman-adv/tp_meter.c
+++ b/net/batman-adv/tp_meter.c
@@ -817,10 +817,15 @@ static void batadv_tp_recv_ack(struct batadv_priv *bat_priv,
 static bool batadv_tp_avail(struct batadv_tp_vars *tp_vars,
 			    size_t payload_len)
 {
+	u32 last_sent = READ_ONCE(tp_vars->last_sent);
 	u32 win_left, win_limit;
 
 	win_limit = atomic_read(&tp_vars->last_acked) + tp_vars->cwnd;
-	win_left = win_limit - tp_vars->last_sent;
+
+	if (batadv_seq_before(last_sent, win_limit))
+		win_left = win_limit - last_sent;
+	else
+		win_left = 0;
 
 	return win_left >= payload_len;
 }