diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index 5ea35a14541..a46c58ff7c7 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -3442,8 +3442,6 @@ class CGUnionStruct(CGThing):
             "            %s::e%s(ref inner) => inner.to_jsval(cx, rval),"
             % (self.type, v["name"]) for v in templateVars
         ]
-        # XXXManishearth The following should be #[must_root],
-        # however we currently allow it till #2661 is fixed
         return ("""\
 pub enum %s {
 %s