diff --git a/library/std/src/sys/os_str/mod.rs b/library/std/src/sys/os_str/mod.rs
index b509729475b..345e661586d 100644
--- a/library/std/src/sys/os_str/mod.rs
+++ b/library/std/src/sys/os_str/mod.rs
@@ -1,3 +1,5 @@
+#![forbid(unsafe_op_in_unsafe_fn)]
+
 cfg_if::cfg_if! {
     if #[cfg(any(
         target_os = "windows",
diff --git a/library/std/src/sys/os_str/wtf8.rs b/library/std/src/sys/os_str/wtf8.rs
index cc00fcaf13d..806bf033dbc 100644
--- a/library/std/src/sys/os_str/wtf8.rs
+++ b/library/std/src/sys/os_str/wtf8.rs
@@ -1,7 +1,5 @@
 //! The underlying OsString/OsStr implementation on Windows is a
 //! wrapper around the "WTF-8" encoding; see the `wtf8` module for more.
-#![deny(unsafe_op_in_unsafe_fn)]
-
 use crate::borrow::Cow;
 use crate::collections::TryReserveError;
 use crate::fmt;