diff --git a/scripts/dl_github_archive.py b/scripts/dl_github_archive.py
index b992227dc9..328d588e78 100755
--- a/scripts/dl_github_archive.py
+++ b/scripts/dl_github_archive.py
@@ -133,7 +133,7 @@ class Path(object):
     def tar(path, subdir, into=None, ts=None):
         """Pack ``path`` into tarball ``into``."""
         # --sort=name requires a recent build of GNU tar
-        args = ['tar', '--numeric-owner', '--owner=0', '--group=0', '--sort=name']
+        args = ['tar', '--numeric-owner', '--owner=0', '--group=0', '--sort=name', '--mode=a-s']
         args += ['-C', path, '-cf', into, subdir]
         envs = os.environ.copy()
         if ts is not None: