diff --git a/sys/fs/cd9660/iso.h b/sys/fs/cd9660/iso.h
--- a/sys/fs/cd9660/iso.h
+++ b/sys/fs/cd9660/iso.h
@@ -212,7 +212,7 @@
 	u_char len_au			[ISODCL (247, 250)]; /* 723 */
 };
 
-#ifdef _KERNEL
+#if defined(_KERNEL) || defined(_WANT_ISO_MNT)
 
 /* CD-ROM Format type */
 enum ISO_FTYPE	{ ISO_FTYPE_DEFAULT, ISO_FTYPE_9660, ISO_FTYPE_RRIP,
@@ -253,6 +253,10 @@
 	void *im_l2d;
 };
 
+#endif /* defined(_KERNEL) || defined(_WANT_ISO_MNT) */
+
+#ifdef _KERNEL
+
 struct ifid {
 	u_short		ifid_len;
 	u_short		ifid_pad;