diff --git a/sys/fs/cd9660/cd9660_vfsops.c b/sys/fs/cd9660/cd9660_vfsops.c
index d3e360d2ae9..138871d4046 100644
--- a/sys/fs/cd9660/cd9660_vfsops.c
+++ b/sys/fs/cd9660/cd9660_vfsops.c
@@ -205,7 +205,7 @@ iso_mountfs(devvp, mp)
 	struct vnode *devvp;
 	struct mount *mp;
 {
-	struct iso_mnt *isomp = (struct iso_mnt *)0;
+	struct iso_mnt *isomp = NULL;
 	struct buf *bp = NULL;
 	struct buf *pribp = NULL, *supbp = NULL;
 	struct cdev *dev;