diff --git a/objc2/src/lib.rs b/objc2/src/lib.rs
index e97e6b207..2097187bf 100644
--- a/objc2/src/lib.rs
+++ b/objc2/src/lib.rs
@@ -65,6 +65,7 @@ The bindings can be used on Linux or *BSD utilizing the
 )]
 #![warn(missing_docs)]
 #![allow(clippy::missing_safety_doc)]
+#![feature(fundamental)]
 // Update in Cargo.toml as well.
 #![doc(html_root_url = "https://docs.rs/objc2/0.2.7")]
 
diff --git a/objc2/src/rc/id.rs b/objc2/src/rc/id.rs
index a2b9f5435..a4d93c47e 100644
--- a/objc2/src/rc/id.rs
+++ b/objc2/src/rc/id.rs
@@ -92,6 +92,7 @@ use crate::Message;
 /// let cloned: Id<T, Shared> = shared.clone();
 /// // Do something with `&T` here
 /// ```
+#[fundamental]
 #[repr(transparent)]
 // TODO: Figure out if `Message` bound on `T` would be better here?
 // TODO: Add `?Sized + ptr::Thin` bound on `T` to allow for extern types