diff --git a/nix-js/tests/lang.rs b/nix-js/tests/lang.rs
index 4673072..8c152b7 100644
--- a/nix-js/tests/lang.rs
+++ b/nix-js/tests/lang.rs
@@ -250,7 +250,10 @@ eval_okay_test!(strings_as_attrs_names);
 eval_okay_test!(substring);
 eval_okay_test!(substring_context);
 eval_okay_test!(symlink_resolution);
-eval_okay_test!(tail_call_1);
+eval_okay_test!(
+    #[ignore = "TCO not implemented, also disabled in CppNix"]
+    tail_call_1
+);
 eval_okay_test!(tojson);
 eval_okay_test!(
     #[ignore = "not implemented: toXML"]