diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index c6a7d4582dc6790be3a50f545faa36bc07ea8a7f..38d9df3fb199fed88a4825b7b392e20c27e85c2a 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -310,6 +310,7 @@ int mbox_flush(struct mbox_chan *chan, unsigned long timeout)
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(mbox_flush);
 
 /**
  * mbox_request_channel - Request a mailbox channel.