diff --git a/io/src/lib.rs b/io/src/lib.rs
index 2b8008f1..49862308 100644
--- a/io/src/lib.rs
+++ b/io/src/lib.rs
@@ -13,9 +13,9 @@
 //! This traits are not one-for-one drop-ins, but are as close as possible while still implementing
 //! `std::io`'s traits without unnecessary complexity.
 
+#![cfg_attr(not(feature = "std"), no_std)]
 // Experimental features we need.
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
-#![cfg_attr(not(feature = "std"), no_std)]
 
 #[cfg(any(feature = "alloc", feature = "std"))]
 extern crate alloc;