diff --git a/drivers/mailbox/arm_mhuv2.c b/drivers/mailbox/arm_mhuv2.c
index 3af15083a25a..68f766621b9b 100644
--- a/drivers/mailbox/arm_mhuv2.c
+++ b/drivers/mailbox/arm_mhuv2.c
@@ -552,7 +552,8 @@ static irqreturn_t mhuv2_sender_interrupt(int irq, void *data)
 	priv = chan->con_priv;
 
 	if (!IS_PROTOCOL_DOORBELL(priv)) {
-		writel_relaxed(1, &mhu->send->ch_wn[priv->ch_wn_idx + priv->windows - 1].int_clr);
+		for (i = 0; i < priv->windows; i++)
+			writel_relaxed(1, &mhu->send->ch_wn[priv->ch_wn_idx + i].int_clr);
 
 		if (chan->cl) {
 			mbox_chan_txdone(chan, 0);