diff --git a/filedescriptor/src/unix.rs b/filedescriptor/src/unix.rs
index b97dee4ca..a85843c9a 100644
--- a/filedescriptor/src/unix.rs
+++ b/filedescriptor/src/unix.rs
@@ -384,7 +384,7 @@ mod macos {
     impl FdSet {
         pub fn new() -> Self {
             unsafe {
-                let mut set = std::mem::uninitialized();
+                let mut set = std::mem::MaybeUninit::uninit().assume_init();
                 FD_ZERO(&mut set);
                 Self { set }
             }