diff --git a/library/core/src/ptr/alignment.rs b/library/core/src/ptr/alignment.rs
index 61eb23c7bca..fd3e4326ac3 100644
--- a/library/core/src/ptr/alignment.rs
+++ b/library/core/src/ptr/alignment.rs
@@ -168,6 +168,7 @@ impl From<Alignment> for usize {
 }
 
 #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
+#[unstable(feature = "ptr_alignment_type", issue = "102070")]
 impl const cmp::PartialEq for Alignment {
     #[inline]
     fn eq(&self, other: &Self) -> bool {
@@ -176,6 +177,7 @@ impl const cmp::PartialEq for Alignment {
 }
 
 #[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
+#[unstable(feature = "ptr_alignment_type", issue = "102070")]
 impl const cmp::Ord for Alignment {
     #[inline]
     fn cmp(&self, other: &Self) -> cmp::Ordering {