diff --git a/sys/fs/devfs/devfs_vfsops.c b/sys/fs/devfs/devfs_vfsops.c
index 2173398a4431..10c26550b8f4 100644
--- a/sys/fs/devfs/devfs_vfsops.c
+++ b/sys/fs/devfs/devfs_vfsops.c
@@ -122,7 +122,7 @@ devfs_unmount(mp, mntflags, td)
 
 	fmp = VFSTODEVFS(mp);
 	if (mntflags & MNT_FORCE)
-		flags |= FORCECLOSE;
+		return (EOPNOTSUPP);
 	/* There is 1 extra root vnode reference from devfs_mount(). */
 	error = vflush(mp, 1, flags, td);
 	if (error)