diff --git a/tokio-timer/src/atomic.rs b/tokio-timer/src/atomic.rs
deleted file mode 100644
index d60bd7645..000000000
--- a/tokio-timer/src/atomic.rs
+++ /dev/null
@@ -1,88 +0,0 @@
-//! Implementation of an atomic u64 cell. On 64 bit platforms, this is a wrapper
-//! around `AtomicUsize`. On 32 bit platforms, this is implemented using a
-//! `Mutex`.
-//!
-//! This file can be removed if/when `AtomicU64` lands in `std`.
-
-pub use self::imp::AtomicU64;
-
-#[cfg(target_pointer_width = "64")]
-mod imp {
-    use std::sync::atomic::{AtomicUsize, Ordering};
-
-    #[derive(Debug)]
-    pub struct AtomicU64 {
-        inner: AtomicUsize,
-    }
-
-    impl AtomicU64 {
-        pub fn new(val: u64) -> AtomicU64 {
-            AtomicU64 {
-                inner: AtomicUsize::new(val as usize),
-            }
-        }
-
-        pub fn load(&self, ordering: Ordering) -> u64 {
-            self.inner.load(ordering) as u64
-        }
-
-        pub fn store(&self, val: u64, ordering: Ordering) {
-            self.inner.store(val as usize, ordering)
-        }
-
-        pub fn fetch_or(&self, val: u64, ordering: Ordering) -> u64 {
-            self.inner.fetch_or(val as usize, ordering) as u64
-        }
-
-        pub fn compare_and_swap(&self, old: u64, new: u64, ordering: Ordering) -> u64 {
-            self.inner
-                .compare_and_swap(old as usize, new as usize, ordering) as u64
-        }
-    }
-}
-
-#[cfg(not(target_pointer_width = "64"))]
-mod imp {
-    use std::sync::atomic::Ordering;
-    use std::sync::Mutex;
-
-    #[derive(Debug)]
-    pub struct AtomicU64 {
-        inner: Mutex<u64>,
-    }
-
-    impl AtomicU64 {
-        pub fn new(val: u64) -> AtomicU64 {
-            AtomicU64 {
-                inner: Mutex::new(val),
-            }
-        }
-
-        pub fn load(&self, _: Ordering) -> u64 {
-            *self.inner.lock().unwrap()
-        }
-
-        pub fn store(&self, val: u64, _: Ordering) {
-            *self.inner.lock().unwrap() = val;
-        }
-
-        pub fn fetch_or(&self, val: u64, _: Ordering) -> u64 {
-            let mut lock = self.inner.lock().unwrap();
-            let prev = *lock;
-            *lock = prev | val;
-            prev
-        }
-
-        pub fn compare_and_swap(&self, old: u64, new: u64, _: Ordering) -> u64 {
-            let mut lock = self.inner.lock().unwrap();
-            let prev = *lock;
-
-            if prev != old {
-                return prev;
-            }
-
-            *lock = new;
-            prev
-        }
-    }
-}
diff --git a/tokio-timer/src/lib.rs b/tokio-timer/src/lib.rs
index 714003982..2541f03e4 100644
--- a/tokio-timer/src/lib.rs
+++ b/tokio-timer/src/lib.rs
@@ -38,7 +38,6 @@ pub mod throttle;
 pub mod timeout;
 pub mod timer;
 
-mod atomic;
 mod delay;
 mod error;
 mod interval;
diff --git a/tokio-timer/src/timer/entry.rs b/tokio-timer/src/timer/entry.rs
index a8c053af9..650ee071b 100644
--- a/tokio-timer/src/timer/entry.rs
+++ b/tokio-timer/src/timer/entry.rs
@@ -1,11 +1,10 @@
-use crate::atomic::AtomicU64;
 use crate::timer::{HandlePriv, Inner};
 use crate::Error;
 use crossbeam_utils::CachePadded;
 use std::cell::UnsafeCell;
 use std::ptr;
-use std::sync::atomic::AtomicBool;
 use std::sync::atomic::Ordering::{Relaxed, SeqCst};
+use std::sync::atomic::{AtomicBool, AtomicU64};
 use std::sync::{Arc, Weak};
 use std::task::{self, Poll};
 use std::time::{Duration, Instant};
diff --git a/tokio-timer/src/timer/mod.rs b/tokio-timer/src/timer/mod.rs
index 6b2d7f83c..e38dfc1ed 100644
--- a/tokio-timer/src/timer/mod.rs
+++ b/tokio-timer/src/timer/mod.rs
@@ -49,11 +49,10 @@ pub use self::handle::{with_default, Handle};
 pub use self::now::{Now, SystemNow};
 pub(crate) use self::registration::Registration;
 
-use crate::atomic::AtomicU64;
 use crate::wheel;
 use crate::Error;
-use std::sync::atomic::AtomicUsize;
 use std::sync::atomic::Ordering::SeqCst;
+use std::sync::atomic::{AtomicU64, AtomicUsize};
 use std::sync::Arc;
 use std::time::{Duration, Instant};
 use std::usize;