diff --git a/cli/koji b/cli/koji
index f4ca8e01..896b6256 100755
--- a/cli/koji
+++ b/cli/koji
@@ -6892,6 +6892,8 @@ def handle_runroot(options, session, args):
             help=_("Print the ID of the runroot task"))
     parser.add_option("--use-shell", action="store_true", default=False,
             help=_("Run command through a shell, otherwise uses exec"))
+    parser.add_option("--new-chroot", action="store_true", default=False,
+            help=_("Run command with the --new-chroot (systemd-nspawn) option to mock"))
     parser.add_option("--repo-id", type="int", help=_("ID of the repo to use"))
 
     (opts, args) = parser.parse_args(args)
@@ -6912,6 +6914,7 @@ def handle_runroot(options, session, args):
                                 packages=opts.package, mounts=opts.mount,
                                 repo_id=opts.repo_id,
                                 skip_setarch=opts.skip_setarch,
+                                new_chroot=opts.new_chroot,
                                 weight=opts.weight)
     except koji.GenericError, e:
         if 'Invalid method' in str(e):
diff --git a/plugins/builder/runroot.py b/plugins/builder/runroot.py
index 7bf40e4f..83f1898c 100644
--- a/plugins/builder/runroot.py
+++ b/plugins/builder/runroot.py
@@ -92,7 +92,7 @@ class RunRootTask(tasks.BaseTaskHandler):
             if not path.startswith('/'):
                 raise koji.GenericError("bad config: all paths (default_mounts, safe_roots, path_subs) needs to be absolute: %s" % path)
 
-    def handler(self, root, arch, command, keep=False, packages=[], mounts=[], repo_id=None, skip_setarch=False, weight=None, upload_logs=None):
+    def handler(self, root, arch, command, keep=False, packages=[], mounts=[], repo_id=None, skip_setarch=False, weight=None, upload_logs=None, new_chroot=False):
         """Create a buildroot and run a command (as root) inside of it
 
         Command may be a string or a list.
@@ -188,6 +188,8 @@ class RunRootTask(tasks.BaseTaskHandler):
             self.do_mounts(rootdir, [self._get_path_params(x) for x in self.config['default_mounts']])
             self.do_extra_mounts(rootdir, mounts)
             mock_cmd = ['chroot']
+            if new_chroot:
+                mock_cmd.append('--new-chroot')
             if skip_setarch:
                 #we can't really skip it, but we can set it to the current one instead of of the chroot one
                 myarch = platform.uname()[5]