diff --git a/benches/kernel_swap.rs b/benches/kernel_swap.rs
index 0f50a83..24efd6e 100644
--- a/benches/kernel_swap.rs
+++ b/benches/kernel_swap.rs
@@ -1,4 +1,4 @@
-#![feature(asm)]
+#![feature(asm, test)]
 extern crate test;
 use test::Bencher;
 
diff --git a/benches/swap.rs b/benches/swap.rs
index 4379907..227c107 100644
--- a/benches/swap.rs
+++ b/benches/swap.rs
@@ -1,3 +1,4 @@
+#![feature(test)]
 extern crate test;
 extern crate lwkt;
 use lwkt::Context;
diff --git a/build.rs b/build.rs
index a77eea6..2513ee4 100644
--- a/build.rs
+++ b/build.rs
@@ -1,7 +1,7 @@
-#![allow(unstable)]
-use std::io::Command;
-use std::io::fs::PathExtensions;
-use std::io::fs;
+#![feature(io, path, os)]
+use std::old_io::Command;
+use std::old_io::fs::PathExtensions;
+use std::old_io::fs;
 use std::os;
 
 fn main() {
@@ -30,7 +30,7 @@ fn main() {
   }
 
   Command::new("ar").args(&["crus", "libcontext.a"])
-                    .args(objects.as_slice())
+                    .args(&*objects)
                     .cwd(&Path::new(&out_dir))
                     .status().unwrap();
 
diff --git a/src/lib.rs b/src/lib.rs
index a310574..6bff4eb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,8 +1,8 @@
-#![feature(asm)]
+#![feature(asm, core)]
+#![feature(os, libc)]
 #![no_std]
 
 #[macro_use]
-#[allow(unstable)]
 extern crate core;
 
 #[cfg(test)]
diff --git a/src/platform.rs b/src/platform.rs
index a084832..5eb38d7 100644
--- a/src/platform.rs
+++ b/src/platform.rs
@@ -1,4 +1,3 @@
-#![allow(unstable)]
 extern crate libc;
 extern crate std;
 use self::std::prelude::v1::*;