diff --git a/phf/src/lib.rs b/phf/src/lib.rs
index 046853c0..8bf2a689 100644
--- a/phf/src/lib.rs
+++ b/phf/src/lib.rs
@@ -5,7 +5,6 @@
 #![doc(html_root_url="https://sfackler.github.io/doc")]
 #![warn(missing_docs)]
 #![allow(unstable)]
-#![feature(old_orphan_check)]
 #![no_std]
 
 #[macro_use]
diff --git a/phf_mac/src/lib.rs b/phf_mac/src/lib.rs
index 570979ff..daea2a1e 100644
--- a/phf_mac/src/lib.rs
+++ b/phf_mac/src/lib.rs
@@ -2,7 +2,7 @@
 //!
 //! See the documentation for the `phf` crate for more details.
 #![doc(html_root_url="http://sfackler.github.io/doc")]
-#![feature(plugin_registrar, quote, old_orphan_check)]
+#![feature(plugin_registrar, quote)]
 #![allow(unknown_features, unstable)]
 
 extern crate rand;