diff --git a/crates/futures/src/atomics.rs b/crates/futures/src/atomics.rs
index a9644b25..a5d57eac 100644
--- a/crates/futures/src/atomics.rs
+++ b/crates/futures/src/atomics.rs
@@ -7,9 +7,8 @@ use futures::executor::{self, Notify, Spawn};
 use futures::future;
 use futures::prelude::*;
 use futures::sync::oneshot;
-use js_sys::{Atomics, Int32Array, WebAssembly, Function, Promise};
+use js_sys::{Function, Promise};
 use wasm_bindgen::prelude::*;
-use wasm_bindgen::JsCast;
 
 macro_rules! console_log {
     ($($t:tt)*) => (log(&format_args!($($t)*).to_string()))
@@ -112,8 +111,8 @@ impl Future for JsFuture {
 /// resolve**. Instead it will be a leaked promise. This is an unfortunate
 /// limitation of wasm currently that's hoped to be fixed one day!
 pub fn future_to_promise<F>(future: F) -> Promise
-    where
-        F: Future<Item = JsValue, Error = JsValue> + 'static,
+where
+    F: Future<Item = JsValue, Error = JsValue> + 'static,
 {
     _future_to_promise(Box::new(future))
 }
@@ -210,11 +209,16 @@ fn _future_to_promise(future: Box<dyn Future<Item = JsValue, Error = JsValue>>)
     }
 
     impl Notify for Waker {
-        fn notify(&self, id: usize) {
+        fn notify(&self, _id: usize) {
             console_log!("Waker notify");
             if !self.notified.swap(true, Ordering::SeqCst) {
                 console_log!("Waker, inside if");
-                let _ = unsafe { core::arch::wasm32::atomic_notify(&self.value as *const AtomicI32 as *mut i32, 0) };
+                let _ = unsafe {
+                    core::arch::wasm32::atomic_notify(
+                        &self.value as *const AtomicI32 as *mut i32,
+                        0,
+                    )
+                };
             }
         }
     }
@@ -249,20 +253,15 @@ fn _future_to_promise(future: Box<dyn Future<Item = JsValue, Error = JsValue>>)
             }
         };
 
-        let memory_buffer = wasm_bindgen::memory()
-            .dyn_into::<WebAssembly::Memory>()
-            .expect("Should cast a memory to WebAssembly::Memory")
-            .buffer();
-
         let value_location = &package.waker.value as *const AtomicI32 as u32 / 4;
-        let array = Int32Array::new(&memory_buffer);
 
         // Use `Promise.then` on a resolved promise to place our execution
         // onto the next turn of the microtask queue, enqueueing our poll
         // operation. We don't currently poll immediately as it turns out
         // `futures` crate adapters aren't compatible with it and it also
         // helps avoid blowing the stack by accident.
-        let promise = crate::polyfill::wait_async(array, value_location, 0).expect("Should create a Promise");
+        let promise =
+            crate::polyfill::wait_async(value_location, 0).expect("Should create a Promise");
         let closure = Closure::once(Box::new(move |_| {
             Package::poll(&me);
         }) as Box<dyn FnMut(JsValue)>);
@@ -340,8 +339,8 @@ fn _future_to_promise(future: Box<dyn Future<Item = JsValue, Error = JsValue>>)
 ///
 /// This function has the same panic behavior as `future_to_promise`.
 pub fn spawn_local<F>(future: F)
-    where
-        F: Future<Item = (), Error = ()> + 'static,
+where
+    F: Future<Item = (), Error = ()> + 'static,
 {
     future_to_promise(
         future
diff --git a/crates/futures/src/lib.rs b/crates/futures/src/lib.rs
index becc6246..e21c94ea 100644
--- a/crates/futures/src/lib.rs
+++ b/crates/futures/src/lib.rs
@@ -102,7 +102,6 @@
 //! ```
 
 #![feature(stdsimd)]
-
 #![deny(missing_docs)]
 
 #[cfg(feature = "futures_0_3")]
@@ -341,13 +340,10 @@ fn _future_to_promise(future: Box<dyn Future<Item = JsValue, Error = JsValue>>)
                     // our `Waiting` state, and resume the polling process
                     State::Polling => {
                         me.notified.set(State::Waiting(me.clone()));
-
                         break;
                     }
 
-                    State::Waiting(_) => {
-                        panic!("shouldn't see waiting state!")
-                    }
+                    State::Waiting(_) => panic!("shouldn't see waiting state!"),
                 }
 
                 let (val, f) = match me.spawn.borrow_mut().poll_future_notify(me, 0) {
diff --git a/crates/futures/src/polyfill.rs b/crates/futures/src/polyfill.rs
index ded6f50f..b742a3c0 100644
--- a/crates/futures/src/polyfill.rs
+++ b/crates/futures/src/polyfill.rs
@@ -41,7 +41,7 @@ use std::rc::Rc;
 
 use js_sys::{
     encode_uri_component, Array, Atomics, Error, Function, Int32Array, JsString, Promise, Reflect,
-    SharedArrayBuffer,
+    SharedArrayBuffer, WebAssembly,
 };
 use wasm_bindgen::prelude::*;
 use wasm_bindgen::JsCast;
@@ -57,6 +57,8 @@ extern "C" {
     fn log(s: &str);
 }
 
+const DEFAULT_TIMEOUT: f64 = 10.0;
+
 const HELPER_CODE: &'static str = "
 onmessage = function (ev) {
     try {
@@ -103,9 +105,8 @@ fn free_helper(helper: &Rc<Worker>) {
     });
 }
 
-pub fn wait_async(indexed_array: Int32Array, index: u32, value: i32) -> Result<Promise, JsValue> {
-    let timeout = 0.1;
-    wait_async_with_timeout(indexed_array, index, value, timeout)
+pub fn wait_async(index: u32, value: i32) -> Result<Promise, JsValue> {
+    wait_async_with_timeout(index, value, DEFAULT_TIMEOUT)
 }
 
 fn get_array_item(array: &JsValue, index: u32) -> JsValue {
@@ -117,12 +118,14 @@ fn get_array_item(array: &JsValue, index: u32) -> JsValue {
 // for parameter validation.  The promise is resolved with a string as from
 // Atomics.wait, or, in the case something went completely wrong, it is
 // rejected with an error string.
-pub fn wait_async_with_timeout(
-    indexed_array: Int32Array,
-    index: u32,
-    value: i32,
-    timeout: f64,
-) -> Result<Promise, JsValue> {
+pub fn wait_async_with_timeout(index: u32, value: i32, timeout: f64) -> Result<Promise, JsValue> {
+    let memory_buffer = wasm_bindgen::memory()
+        .dyn_into::<WebAssembly::Memory>()
+        .expect("Should cast a memory to WebAssembly::Memory")
+        .buffer();
+
+    let indexed_array = Int32Array::new(&memory_buffer);
+
     if !indexed_array.buffer().has_type::<SharedArrayBuffer>() {
         console_log!("polyfill, not a SharedArrayBuffer");
         return Err(Error::new("Indexed array must be created from SharedArrayBuffer").into());