diff --git a/src/libstd/rc.rs b/src/libstd/rc.rs
index ff6e494b948..5673929d5a1 100644
--- a/src/libstd/rc.rs
+++ b/src/libstd/rc.rs
@@ -192,7 +192,7 @@ impl<T> Clone for Weak<T> {
     }
 }
 
-#[allow(missing_doc)]
+#[doc(hidden)]
 trait RcBoxPtr<T> {
     fn inner<'a>(&'a self) -> &'a RcBox<T>;