diff --git a/src/os/windows/mod.rs b/src/os/windows/mod.rs
index cd8deb6..6dac11b 100644
--- a/src/os/windows/mod.rs
+++ b/src/os/windows/mod.rs
@@ -4,6 +4,6 @@ cfg_std! {
     pub mod io;
 }
 
-cfg_default! {
+cfg_unstable! {
     pub mod fs;
 }