diff --git a/library/std/src/os/mod.rs b/library/std/src/os/mod.rs
index 500e8267cf8..6ca3b8fb22e 100644
--- a/library/std/src/os/mod.rs
+++ b/library/std/src/os/mod.rs
@@ -28,7 +28,7 @@ pub use crate::sys::wasi_ext as wasi;
 // If we're not documenting libstd then we just expose the main modules as we otherwise would.
 
 #[cfg(not(doc))]
-#[cfg(any(target_os = "redox", unix, target_os = "vxworks", target_os = "hermit"))]
+#[cfg(any(unix, target_os = "hermit"))]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use crate::sys::ext as unix;