diff --git a/drivers/macintosh/mediabay.c b/drivers/macintosh/mediabay.c
index 831d751..54bf584 100644
--- a/drivers/macintosh/mediabay.c
+++ b/drivers/macintosh/mediabay.c
@@ -63,7 +63,7 @@
 	int				value_count;
 	int				timer;
 	struct macio_dev		*mdev;
-	struct mb_ops*			ops;
+	const struct mb_ops*		ops;
 	int				index;
 	int				cached_gpio;
 	int				sleeping;