diff --git a/nixos/lib/make-options-doc/default.nix b/nixos/lib/make-options-doc/default.nix
index e5813d9a3ef..772b7d3add9 100644
--- a/nixos/lib/make-options-doc/default.nix
+++ b/nixos/lib/make-options-doc/default.nix
@@ -86,7 +86,7 @@ let
   optionsList = lib.sort optionLess optionsListDesc;
 
   # Convert the list of options into an XML file.
-  optionsXML = pkgs.writeText "options.xml" (builtins.toXML optionsList);
+  optionsXML = builtins.toFile "options.xml" (builtins.toXML optionsList);
 
   optionsNix = builtins.listToAttrs (map (o: { name = o.name; value = removeAttrs o ["name" "visible" "internal"]; }) optionsList);