diff --git a/drivers/mailbox/hi6220-mailbox.c b/drivers/mailbox/hi6220-mailbox.c
index 613722db5daf..519376d3534c 100644
--- a/drivers/mailbox/hi6220-mailbox.c
+++ b/drivers/mailbox/hi6220-mailbox.c
@@ -221,7 +221,7 @@ static void hi6220_mbox_shutdown(struct mbox_chan *chan)
 	mbox->irq_map_chan[mchan->ack_irq] = NULL;
 }
 
-static struct mbox_chan_ops hi6220_mbox_ops = {
+static const struct mbox_chan_ops hi6220_mbox_ops = {
 	.send_data    = hi6220_mbox_send_data,
 	.startup      = hi6220_mbox_startup,
 	.shutdown     = hi6220_mbox_shutdown,
diff --git a/drivers/mailbox/mailbox-xgene-slimpro.c b/drivers/mailbox/mailbox-xgene-slimpro.c
index dd2afbca51c9..a7040163dd43 100644
--- a/drivers/mailbox/mailbox-xgene-slimpro.c
+++ b/drivers/mailbox/mailbox-xgene-slimpro.c
@@ -174,7 +174,7 @@ static void slimpro_mbox_shutdown(struct mbox_chan *chan)
 	devm_free_irq(mb_chan->dev, mb_chan->irq, mb_chan);
 }
 
-static struct mbox_chan_ops slimpro_mbox_ops = {
+static const struct mbox_chan_ops slimpro_mbox_ops = {
 	.send_data = slimpro_mbox_send_data,
 	.startup = slimpro_mbox_startup,
 	.shutdown = slimpro_mbox_shutdown,