diff --git a/zenodo/make_open_package.py b/zenodo/make_open_package.py
index 1eabb82..4190918 100644
--- a/zenodo/make_open_package.py
+++ b/zenodo/make_open_package.py
@@ -54,7 +54,8 @@ def main():
     git("-c", "core.autocrlf=false", "archive", "--format=tar", "--prefix=source/", "-o", tar, "HEAD")
     shutil.unpack_archive(tar, PKG)
     os.remove(tar)
-    git("bundle", "create", os.path.join(PKG, "sim-numerics.bundle"), "release")
+    # HEAD too, so that `git clone sim-numerics.bundle` checks the branch out
+    git("bundle", "create", os.path.join(PKG, "sim-numerics.bundle"), "HEAD", "release")
     for w in WHEELS:
         shutil.copy(os.path.join(ROOT, w), os.path.join(PKG, "wheels"))
     src = os.path.join(PKG, "source")          # from the archive: LF, exactly as committed