diff --git a/library/alloc/src/sync.rs b/library/alloc/src/sync.rs
index 53ba9c283ae23..7c03345aba507 100644
--- a/library/alloc/src/sync.rs
+++ b/library/alloc/src/sync.rs
@@ -14,7 +14,7 @@ use core::hint;
 use core::intrinsics::abort;
 use core::iter;
 use core::marker::{PhantomData, Unpin, Unsize};
-use core::mem::{self, align_of_val, size_of_val};
+use core::mem::{self, align_of_val_raw, size_of_val};
 use core::ops::{CoerceUnsized, Deref, DispatchFromDyn, Receiver};
 use core::pin::Pin;
 use core::ptr::{self, NonNull};
@@ -2366,7 +2366,7 @@ unsafe fn data_offset<T: ?Sized>(ptr: *const T) -> isize {
     // Because it is `?Sized`, it will always be the last field in memory.
     // Note: This is a detail of the current implementation of the compiler,
     // and is not a guaranteed language detail. Do not rely on it outside of std.
-    unsafe { data_offset_align(align_of_val(&*ptr)) }
+    unsafe { data_offset_align(align_of_val_raw(ptr)) }
 }
 
 #[inline]