diff --git a/sys/sys/mount.h b/sys/sys/mount.h
index 0da261bf64a3..8149a0c13686 100644
--- a/sys/sys/mount.h
+++ b/sys/sys/mount.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)mount.h	7.22 (Berkeley) 6/3/91
- *	$Id: mount.h,v 1.8 1993/05/20 16:22:43 cgd Exp $
+ *	$Id: mount.h,v 1.9 1993/06/10 01:20:30 cgd Exp $
  */
 
 #ifndef _SYS_MOUNT_H_
@@ -84,7 +84,8 @@ struct statfs {
 #define MOUNT_ISOFS	5		/* iso9660 cdrom */
 #define MOUNT_FDESC	6		/* /dev/fd filesystem */
 #define MOUNT_KERNFS	7		/* kernel variable filesystem */
-#define	MOUNT_MAXTYPE	7
+#define MOUNT_DEVFS	8		/* device node filesystem */
+#define	MOUNT_MAXTYPE	MOUNT_DEVFS
 
 /*
  * Structure per mounted file system.