diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 2f23a697a58c1..d0b06d6bae5d9 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -112,7 +112,7 @@
 #![feature(rustc_const_unstable)]
 #![feature(const_vec_new)]
 #![feature(slice_partition_dedup)]
-#![feature(maybe_uninit, maybe_uninit_slice)]
+#![feature(maybe_uninit, maybe_uninit_slice, maybe_uninit_array)]
 #![feature(alloc_layout_extra)]
 #![feature(try_trait)]
 
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 2c0d0dd149072..d046236b5353a 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -122,7 +122,7 @@
 #![feature(structural_match)]
 #![feature(abi_unadjusted)]
 #![feature(adx_target_feature)]
-#![feature(maybe_uninit, maybe_uninit_slice)]
+#![feature(maybe_uninit, maybe_uninit_slice, maybe_uninit_array)]
 #![feature(unrestricted_attribute_tokens)]
 
 #[prelude_import]
diff --git a/src/libcore/macros.rs b/src/libcore/macros.rs
index 02f8065eb210d..fdbfa56000b8e 100644
--- a/src/libcore/macros.rs
+++ b/src/libcore/macros.rs
@@ -567,7 +567,7 @@ macro_rules! unimplemented {
 ///
 /// [`MaybeUninit`]: mem/union.MaybeUninit.html
 #[macro_export]
-#[unstable(feature = "maybe_uninit_slice", issue = "53491")]
+#[unstable(feature = "maybe_uninit_array", issue = "53491")]
 macro_rules! uninitialized_array {
     // This `into_initialized` is safe because an array of `MaybeUninit` does not
     // require initialization.