diff --git a/library/core/src/ops/async_function.rs b/library/core/src/ops/async_function.rs
index c90ae7babbd93..6be42ca7d32fe 100644
--- a/library/core/src/ops/async_function.rs
+++ b/library/core/src/ops/async_function.rs
@@ -6,7 +6,6 @@ use crate::marker::Tuple;
 /// All `async fn` and functions returning futures implement this trait.
 #[stable(feature = "async_closure", since = "1.85.0")]
 #[rustc_paren_sugar]
-#[fundamental]
 #[must_use = "async closures are lazy and do nothing unless called"]
 #[lang = "async_fn"]
 pub trait AsyncFn<Args: Tuple>: AsyncFnMut<Args> {
@@ -20,7 +19,6 @@ pub trait AsyncFn<Args: Tuple>: AsyncFnMut<Args> {
 /// All `async fn` and functions returning futures implement this trait.
 #[stable(feature = "async_closure", since = "1.85.0")]
 #[rustc_paren_sugar]
-#[fundamental]
 #[must_use = "async closures are lazy and do nothing unless called"]
 #[lang = "async_fn_mut"]
 pub trait AsyncFnMut<Args: Tuple>: AsyncFnOnce<Args> {
@@ -41,7 +39,6 @@ pub trait AsyncFnMut<Args: Tuple>: AsyncFnOnce<Args> {
 /// All `async fn` and functions returning futures implement this trait.
 #[stable(feature = "async_closure", since = "1.85.0")]
 #[rustc_paren_sugar]
-#[fundamental]
 #[must_use = "async closures are lazy and do nothing unless called"]
 #[lang = "async_fn_once"]
 pub trait AsyncFnOnce<Args: Tuple> {