diff --git a/library/std/src/sys/unix/fd/tests.rs b/library/std/src/sys/unix/fd/tests.rs
index a932043cbc62..c9520485c3c7 100644
--- a/library/std/src/sys/unix/fd/tests.rs
+++ b/library/std/src/sys/unix/fd/tests.rs
@@ -3,7 +3,7 @@ use core::mem::ManuallyDrop;
 
 #[test]
 fn limit_vector_count() {
-    let stdout = ManuallyDrop::new(FileDesc { fd: 1 });
+    let stdout = ManuallyDrop::new(unsafe { FileDesc { fd: 1 } });
     let bufs = (0..1500).map(|_| IoSlice::new(&[])).collect::<Vec<_>>();
     assert!(stdout.write_vectored(&bufs).is_ok());
 }