diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs
index 8b96cf06be4..cedf58c27ff 100644
--- a/library/core/src/ptr/const_ptr.rs
+++ b/library/core/src/ptr/const_ptr.rs
@@ -1320,6 +1320,7 @@ pub unsafe fn read_volatile(self) -> T
     /// }
     /// # }
     /// ```
+    #[must_use]
     #[stable(feature = "align_offset", since = "1.36.0")]
     #[rustc_const_unstable(feature = "const_align_offset", issue = "90962")]
     #[cfg(not(bootstrap))]
diff --git a/library/core/src/ptr/mut_ptr.rs b/library/core/src/ptr/mut_ptr.rs
index 2d73c24b5b4..21c836efd5c 100644
--- a/library/core/src/ptr/mut_ptr.rs
+++ b/library/core/src/ptr/mut_ptr.rs
@@ -1588,6 +1588,7 @@ pub unsafe fn replace(self, src: T) -> T
     /// }
     /// # }
     /// ```
+    #[must_use]
     #[stable(feature = "align_offset", since = "1.36.0")]
     #[rustc_const_unstable(feature = "const_align_offset", issue = "90962")]
     #[cfg(not(bootstrap))]