diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index b2b38820a89cc..bbe6ae8619fec 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -122,7 +122,6 @@
 #![feature(const_slice_len)]
 #![feature(const_str_as_bytes)]
 #![feature(const_str_len)]
-#![cfg_attr(stage0, feature(repr_transparent))]
 
 #[prelude_import]
 #[allow(unused)]