diff --git a/library/std/src/sys/unix/fd.rs b/library/std/src/sys/unix/fd.rs
index e36a53084ba..ba169b251b0 100644
--- a/library/std/src/sys/unix/fd.rs
+++ b/library/std/src/sys/unix/fd.rs
@@ -283,12 +283,12 @@ impl Drop for FileDesc {
 #[cfg(test)]
 mod tests {
     use super::{FileDesc, IoSlice};
+    use core::mem::ManuallyDrop;
 
     #[test]
     fn limit_vector_count() {
-        let stdout = FileDesc { fd: 1 };
+        let stdout = ManuallyDrop::new(FileDesc { fd: 1 });
         let bufs = (0..1500).map(|_| IoSlice::new(&[])).collect::<Vec<_>>();
-
         assert!(stdout.write_vectored(&bufs).is_ok());
     }
 }