diff --git a/pkgs/by-name/ni/nixos-render-docs/src/nixos_render_docs/options.py b/pkgs/by-name/ni/nixos-render-docs/src/nixos_render_docs/options.py
index 9e337e6b1082..c6bfdcbf9b81 100644
--- a/pkgs/by-name/ni/nixos-render-docs/src/nixos_render_docs/options.py
+++ b/pkgs/by-name/ni/nixos-render-docs/src/nixos_render_docs/options.py
@@ -328,7 +328,7 @@ class CommonMarkConverter(BaseConverter[OptionsCommonMarkRenderer]):
         self._anchor_prefix = anchor_prefix
 
     def _parallel_render_prepare(self) -> Any:
-        return (self._renderer._manpage_urls, self._revision)
+        return (self._renderer._manpage_urls, self._revision, self._anchor_style, self._anchor_prefix)
     @classmethod
     def _parallel_render_init_worker(cls, a: Any) -> CommonMarkConverter:
         return cls(*a)