diff --git a/drivers/mailbox/k3-sec-proxy.c b/drivers/mailbox/k3-sec-proxy.c
index 27ccc6e..8dd93a3 100644
--- a/drivers/mailbox/k3-sec-proxy.c
+++ b/drivers/mailbox/k3-sec-proxy.c
@@ -438,6 +438,6 @@
 	.of_match = k3_sec_proxy_ids,
 	.probe = k3_sec_proxy_probe,
 	.remove = k3_sec_proxy_remove,
-	.priv_auto_alloc_size = sizeof(struct k3_sec_proxy_mbox),
+	.priv_auto	= sizeof(struct k3_sec_proxy_mbox),
 	.ops = &k3_sec_proxy_mbox_ops,
 };