diff --git a/rootfs.py b/rootfs.py
index d620d5ac..42d624e3 100755
--- a/rootfs.py
+++ b/rootfs.py
@@ -218,7 +218,7 @@ print(shutil.which('chroot'))
                                                  '--progress=plain',
                                                  '--platform=linux/amd64',
                                                  '--target=package',
-                                                 '-t', 'local/live-bootstrap',
+                                                 '--tag', 'local/live-bootstrap',
                                                  '.')
 
     elif args.bwrap: