diff --git a/src/lib.rs b/src/lib.rs
index 3177a4e4..19818387 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -83,7 +83,6 @@ Feel free to add your project to this list if you happen to use **nalgebra**!
 #![deny(unused_results)]
  #![allow(unstable)]
 #![warn(missing_docs)]
-#![feature(old_orphan_check)]
 #![feature(unboxed_closures)]
 #![doc(html_root_url = "http://nalgebra.org/doc")]