diff --git a/Cargo.toml b/Cargo.toml
index 98c0ff8..74c964e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "redox_syscall"
-version = "0.2.2"
+version = "0.2.3"
 description = "A Rust library to access raw Redox system calls"
 license = "MIT"
 authors = ["Jeremy Soller <jackpot51@gmail.com>"]
diff --git a/src/arch/x86_64.rs b/src/arch/x86_64.rs
index 1323dbd..3f96e2a 100644
--- a/src/arch/x86_64.rs
+++ b/src/arch/x86_64.rs
@@ -1,3 +1,6 @@
+use core::{mem, slice};
+use core::ops::{Deref, DerefMut};
+
 use super::error::{Error, Result};
 
 macro_rules! syscall {