diff --git a/components/servo/lib.rs b/components/servo/lib.rs
index 52f4595b41e..6b080f66193 100644
--- a/components/servo/lib.rs
+++ b/components/servo/lib.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(core, env, libc, path, rustc_private, std_misc, thread_local)]
+#![feature(libc, path, rustc_private, thread_local)]
 
 #[macro_use]
 extern crate log;
diff --git a/components/servo/main.rs b/components/servo/main.rs
index f0d338d9c93..4bef932e562 100644
--- a/components/servo/main.rs
+++ b/components/servo/main.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(env, os, start)]
+#![feature(start)]
 
 #[cfg(target_os="android")]
 extern crate libc;
diff --git a/components/util/lib.rs b/components/util/lib.rs
index 05d0c4058f9..101d240e107 100644
--- a/components/util/lib.rs
+++ b/components/util/lib.rs
@@ -12,14 +12,11 @@
 #![feature(io)]
 #![feature(optin_builtin_traits)]
 #![feature(old_io)]
-#![feature(old_path)]
-#![feature(page_size)]
 #![feature(path)]
 #![feature(path_ext)]
 #![feature(plugin)]
 #![feature(rustc_private)]
 #![feature(std_misc)]
-#![feature(str_words)]
 #![feature(unicode)]
 #![feature(unsafe_destructor)]