diff --git a/library/std/src/sys/pal/windows/os.rs b/library/std/src/sys/pal/windows/os.rs
index 58163f7a73faf..73cb2db8b79e5 100644
--- a/library/std/src/sys/pal/windows/os.rs
+++ b/library/std/src/sys/pal/windows/os.rs
@@ -1,6 +1,5 @@
 //! Implementation of `std::os` functionality for Windows.
 
-#![cfg_attr(bootstrap, allow(unexpected_cfgs))]
 #![allow(nonstandard_style)]
 
 #[cfg(test)]