diff --git a/substrate/primitives/io/src/lib.rs b/substrate/primitives/io/src/lib.rs
index 96c42b074d..7ac2ae1012 100644
--- a/substrate/primitives/io/src/lib.rs
+++ b/substrate/primitives/io/src/lib.rs
@@ -19,7 +19,6 @@
 #![warn(missing_docs)]
 
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(not(feature = "std"), feature(lang_items))]
 #![cfg_attr(not(feature = "std"), feature(alloc_error_handler))]
 #![cfg_attr(not(feature = "std"), feature(core_intrinsics))]