diff --git a/std/src/ffi/mod.rs b/std/src/ffi/mod.rs
index bb64f07844b11..f45fd77e8b167 100644
--- a/std/src/ffi/mod.rs
+++ b/std/src/ffi/mod.rs
@@ -160,7 +160,6 @@
 //! [`from_wide`]: crate::os::windows::ffi::OsStringExt::from_wide "os::windows::ffi::OsStringExt::from_wide"
 
 #![stable(feature = "rust1", since = "1.0.0")]
-#![allow(unsafe_op_in_unsafe_fn)]
 
 #[unstable(feature = "c_str_module", issue = "112134")]
 pub mod c_str;
diff --git a/std/src/ffi/os_str.rs b/std/src/ffi/os_str.rs
index 4a417c84a30a5..f9dba08da4c3c 100644
--- a/std/src/ffi/os_str.rs
+++ b/std/src/ffi/os_str.rs
@@ -184,7 +184,7 @@ impl OsString {
     #[inline]
     #[stable(feature = "os_str_bytes", since = "1.74.0")]
     pub unsafe fn from_encoded_bytes_unchecked(bytes: Vec<u8>) -> Self {
-        OsString { inner: Buf::from_encoded_bytes_unchecked(bytes) }
+        OsString { inner: unsafe { Buf::from_encoded_bytes_unchecked(bytes) } }
     }
 
     /// Converts to an [`OsStr`] slice.
@@ -813,7 +813,7 @@ impl OsStr {
     #[inline]
     #[stable(feature = "os_str_bytes", since = "1.74.0")]
     pub unsafe fn from_encoded_bytes_unchecked(bytes: &[u8]) -> &Self {
-        Self::from_inner(Slice::from_encoded_bytes_unchecked(bytes))
+        Self::from_inner(unsafe { Slice::from_encoded_bytes_unchecked(bytes) })
     }
 
     #[inline]