diff --git a/drivers/mailbox/stm32-ipcc.c b/drivers/mailbox/stm32-ipcc.c
index dda108735fc..49f7795b3cd 100644
--- a/drivers/mailbox/stm32-ipcc.c
+++ b/drivers/mailbox/stm32-ipcc.c
@@ -147,7 +147,7 @@ static const struct udevice_id stm32_ipcc_ids[] = {
 	{ }
 };
 
-struct mbox_ops stm32_ipcc_mbox_ops = {
+static const struct mbox_ops stm32_ipcc_mbox_ops = {
 	.request = stm32_ipcc_request,
 	.rfree = stm32_ipcc_free,
 	.send = stm32_ipcc_send,