diff --git a/drivers/firmware/scmi/mailbox_agent.c b/drivers/firmware/scmi/mailbox_agent.c
index a85cff1..3f4b04a 100644
--- a/drivers/firmware/scmi/mailbox_agent.c
+++ b/drivers/firmware/scmi/mailbox_agent.c
@@ -97,7 +97,7 @@
 	.name		= "scmi-over-mailbox",
 	.id		= UCLASS_SCMI_AGENT,
 	.of_match	= scmi_mbox_ids,
-	.priv_auto_alloc_size = sizeof(struct scmi_mbox_channel),
+	.priv_auto	= sizeof(struct scmi_mbox_channel),
 	.probe		= scmi_mbox_probe,
 	.ops		= &scmi_mbox_ops,
 };