Index: head/sbin/mount/mount.c
===================================================================
--- head/sbin/mount/mount.c
+++ head/sbin/mount/mount.c
@@ -398,7 +398,9 @@
 					have_fstab = 1;
 					mntfromname = mntbuf->f_mntfromname;
 				} else if (argv[0][0] == '/' &&
-				    argv[0][1] == '\0') {
+				    argv[0][1] == '\0' &&
+				    strcmp(fs->fs_vfstype,
+				    mntbuf->f_fstypename) == 0) {
 					fs = getfsfile("/");
 					have_fstab = 1;
 					mntfromname = fs->fs_spec;