diff --git a/src/librustdoc/clean/types.rs b/src/librustdoc/clean/types.rs
index 202449748c4..e898727d463 100644
--- a/src/librustdoc/clean/types.rs
+++ b/src/librustdoc/clean/types.rs
@@ -155,7 +155,7 @@ impl Item {
         name: Option<Symbol>,
         kind: ItemKind,
         attrs: Box<Attributes>,
-        cx: &DocContext<'_>,
+        cx: &mut DocContext<'_>,
     ) -> Item {
         debug!("name={:?}, def_id={:?}", name, def_id);