diff --git a/compiler/rustc_index/src/idx.rs b/compiler/rustc_index/src/idx.rs
index 2fb2008f9a3d..60c4dd90d8f6 100644
--- a/compiler/rustc_index/src/idx.rs
+++ b/compiler/rustc_index/src/idx.rs
@@ -135,7 +135,7 @@ impl<I: Idx, T> IntoSliceIdx<I, [T]> for core::range::RangeInclusive<I> {
     }
 }
 
-#[cfg(all(feature = "nightly", not(bootstrap)))]
+#[cfg(feature = "nightly")]
 impl<I: Idx, T> IntoSliceIdx<I, [T]> for core::range::RangeToInclusive<I> {
     type Output = core::range::RangeToInclusive<usize>;
     #[inline]
diff --git a/compiler/rustc_index/src/lib.rs b/compiler/rustc_index/src/lib.rs
index f61b5cf52798..42d284938468 100644
--- a/compiler/rustc_index/src/lib.rs
+++ b/compiler/rustc_index/src/lib.rs
@@ -1,6 +1,5 @@
 // tidy-alphabetical-start
 #![cfg_attr(all(feature = "nightly", test), feature(stmt_expr_attributes))]
-#![cfg_attr(bootstrap, feature(new_zeroed_alloc))]
 #![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(feature = "nightly", feature(extend_one, step_trait, test))]
 #![cfg_attr(feature = "nightly", feature(new_range_api))]
diff --git a/src/tools/miri/src/lib.rs b/src/tools/miri/src/lib.rs
index 1206859d1cdc..b756fbb901bc 100644
--- a/src/tools/miri/src/lib.rs
+++ b/src/tools/miri/src/lib.rs
@@ -17,7 +17,7 @@
 #![feature(derive_coerce_pointee)]
 #![feature(arbitrary_self_types)]
 #![feature(iter_advance_by)]
-#![cfg_attr(not(bootstrap), feature(duration_from_nanos_u128))]
+#![feature(duration_from_nanos_u128)]
 // Configure clippy and other lints
 #![allow(
     clippy::collapsible_else_if,