diff --git a/Cargo.lock b/Cargo.lock
index ee8a17753dd..77ebe5633f7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -473,6 +473,7 @@ dependencies = [
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "msg 0.0.1",
  "net_traits 0.0.1",
+ "nonzero 0.0.1",
  "profile_traits 0.0.1",
  "script_traits 0.0.1",
  "servo_config 0.0.1",
@@ -1907,6 +1908,7 @@ dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_derive 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nonzero 0.0.1",
  "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "webrender_api 0.52.0 (git+https://github.com/servo/webrender)",
 ]
@@ -2046,6 +2048,13 @@ name = "nom"
 version = "1.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "nonzero"
+version = "0.0.1"
+dependencies = [
+ "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "nsstring_vendor"
 version = "0.1.0"
diff --git a/components/compositing/Cargo.toml b/components/compositing/Cargo.toml
index 51d48fd00ca..236cf14443c 100644
--- a/components/compositing/Cargo.toml
+++ b/components/compositing/Cargo.toml
@@ -9,6 +9,9 @@ publish = false
 name = "compositing"
 path = "lib.rs"
 
+[features]
+unstable = ["nonzero/unstable"]
+
 [dependencies]
 euclid = "0.15"
 gfx_traits = {path = "../gfx_traits"}
@@ -18,6 +21,7 @@ ipc-channel = "0.8"
 log = "0.3.5"
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
+nonzero = {path = "../nonzero"}
 profile_traits = {path = "../profile_traits"}
 script_traits = {path = "../script_traits"}
 servo_config = {path = "../config"}
diff --git a/components/compositing/compositor.rs b/components/compositing/compositor.rs
index 35e8a9340ef..7e77157b845 100644
--- a/components/compositing/compositor.rs
+++ b/components/compositing/compositor.rs
@@ -6,7 +6,6 @@ use CompositionPipeline;
 use SendableFrameTree;
 use compositor_thread::{CompositorProxy, CompositorReceiver};
 use compositor_thread::{InitialCompositorState, Msg, RenderListener};
-use core::nonzero::NonZero;
 use euclid::{Point2D, TypedPoint2D, TypedVector2D, ScaleFactor};
 use gfx_traits::Epoch;
 use gleam::gl;
@@ -14,6 +13,7 @@ use image::{DynamicImage, ImageFormat, RgbImage};
 use ipc_channel::ipc::{self, IpcSharedMemory};
 use msg::constellation_msg::{PipelineId, PipelineIndex, PipelineNamespaceId};
 use net_traits::image::base::{Image, PixelFormat};
+use nonzero::NonZeroU32;
 use profile_traits::time::{self, ProfilerCategory, profile};
 use script_traits::{AnimationState, AnimationTickType, ConstellationControlMsg};
 use script_traits::{ConstellationMsg, LayoutControlMsg, MouseButton};
@@ -62,7 +62,7 @@ impl ConvertPipelineIdFromWebRender for webrender_api::PipelineId {
     fn from_webrender(&self) -> PipelineId {
         PipelineId {
             namespace_id: PipelineNamespaceId(self.0),
-            index: PipelineIndex(NonZero::new(self.1).expect("Webrender pipeline zero?")),
+            index: PipelineIndex(NonZeroU32::new(self.1).expect("Webrender pipeline zero?")),
         }
     }
 }
diff --git a/components/compositing/lib.rs b/components/compositing/lib.rs
index 4e2af3b02f1..ee053c47182 100644
--- a/components/compositing/lib.rs
+++ b/components/compositing/lib.rs
@@ -3,9 +3,8 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #![deny(unsafe_code)]
-#![feature(nonzero)]
+#![cfg_attr(feature = "unstable", feature(nonzero))]
 
-extern crate core;
 extern crate euclid;
 extern crate gfx_traits;
 extern crate gleam;
@@ -15,6 +14,7 @@ extern crate ipc_channel;
 extern crate log;
 extern crate msg;
 extern crate net_traits;
+extern crate nonzero;
 extern crate profile_traits;
 extern crate script_traits;
 extern crate servo_config;
diff --git a/components/msg/Cargo.toml b/components/msg/Cargo.toml
index 3cb93c28572..0f1e39e8182 100644
--- a/components/msg/Cargo.toml
+++ b/components/msg/Cargo.toml
@@ -9,9 +9,13 @@ publish = false
 name = "msg"
 path = "lib.rs"
 
+[features]
+unstable = ["nonzero/unstable"]
+
 [dependencies]
 bitflags = "0.7"
 heapsize = "0.4"
 heapsize_derive = "0.1"
-serde = { version = "1.0.14", features = [ "unstable" ] }
+nonzero = {path = "../nonzero"}
+serde = "1.0.14"
 webrender_api = {git = "https://github.com/servo/webrender", features = ["ipc"]}
diff --git a/components/msg/constellation_msg.rs b/components/msg/constellation_msg.rs
index 823db993b38..da9bb3ea0cb 100644
--- a/components/msg/constellation_msg.rs
+++ b/components/msg/constellation_msg.rs
@@ -5,7 +5,7 @@
 //! The high-level interface from script to constellation. Using this abstract interface helps
 //! reduce coupling between these two components.
 
-use core::nonzero::NonZero;
+use nonzero::NonZeroU32;
 use std::cell::Cell;
 use std::fmt;
 use webrender_api;
@@ -195,9 +195,9 @@ impl PipelineNamespace {
         });
     }
 
-    fn next_index(&mut self) -> NonZero<u32> {
+    fn next_index(&mut self) -> NonZeroU32 {
         self.index += 1;
-        NonZero::new(self.index).expect("pipeline id index wrapped!")
+        NonZeroU32::new(self.index).expect("pipeline id index wrapped!")
     }
 
     fn next_pipeline_id(&mut self) -> PipelineId {
@@ -221,7 +221,7 @@ thread_local!(pub static PIPELINE_NAMESPACE: Cell<Option<PipelineNamespace>> = C
 pub struct PipelineNamespaceId(pub u32);
 
 #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
-pub struct PipelineIndex(pub NonZero<u32>);
+pub struct PipelineIndex(pub NonZeroU32);
 known_heap_size!(0, PipelineIndex);
 
 #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, HeapSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
@@ -264,7 +264,7 @@ impl fmt::Display for PipelineId {
 }
 
 #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
-pub struct BrowsingContextIndex(pub NonZero<u32>);
+pub struct BrowsingContextIndex(pub NonZeroU32);
 known_heap_size!(0, BrowsingContextIndex);
 
 #[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, HeapSizeOf, Ord, PartialEq, PartialOrd, Serialize)]
@@ -339,11 +339,15 @@ impl PartialEq<BrowsingContextId> for TopLevelBrowsingContextId {
 // We provide ids just for unit testing.
 pub const TEST_NAMESPACE: PipelineNamespaceId = PipelineNamespaceId(1234);
 #[allow(unsafe_code)]
-pub const TEST_PIPELINE_INDEX: PipelineIndex = unsafe { PipelineIndex(NonZero::new_unchecked(5678)) };
+#[cfg(feature = "unstable")]
+pub const TEST_PIPELINE_INDEX: PipelineIndex = unsafe { PipelineIndex(NonZeroU32::new_unchecked(5678)) };
+#[cfg(feature = "unstable")]
 pub const TEST_PIPELINE_ID: PipelineId = PipelineId { namespace_id: TEST_NAMESPACE, index: TEST_PIPELINE_INDEX };
 #[allow(unsafe_code)]
+#[cfg(feature = "unstable")]
 pub const TEST_BROWSING_CONTEXT_INDEX: BrowsingContextIndex =
-    unsafe { BrowsingContextIndex(NonZero::new_unchecked(8765)) };
+    unsafe { BrowsingContextIndex(NonZeroU32::new_unchecked(8765)) };
+#[cfg(feature = "unstable")]
 pub const TEST_BROWSING_CONTEXT_ID: BrowsingContextId =
     BrowsingContextId { namespace_id: TEST_NAMESPACE, index: TEST_BROWSING_CONTEXT_INDEX };
 
diff --git a/components/msg/lib.rs b/components/msg/lib.rs
index 0876603c1a5..b1743ad02a9 100644
--- a/components/msg/lib.rs
+++ b/components/msg/lib.rs
@@ -2,16 +2,16 @@
  * 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(const_fn)]
-#![feature(const_nonzero_new)]
-#![feature(nonzero)]
+#![cfg_attr(feature = "unstable", feature(nonzero))]
+#![cfg_attr(feature = "unstable", feature(const_fn))]
+#![cfg_attr(feature = "unstable", feature(const_nonzero_new))]
 #![deny(unsafe_code)]
 
 #[macro_use]
 extern crate bitflags;
-extern crate core;
 #[macro_use] extern crate heapsize;
 #[macro_use] extern crate heapsize_derive;
+extern crate nonzero;
 #[macro_use] extern crate serde;
 extern crate webrender_api;
 
diff --git a/components/servo/Cargo.toml b/components/servo/Cargo.toml
index 86994a945d1..ddfb938850b 100644
--- a/components/servo/Cargo.toml
+++ b/components/servo/Cargo.toml
@@ -18,7 +18,12 @@ energy-profiling = ["profile_traits/energy-profiling"]
 debugmozjs = ["script/debugmozjs"]
 googlevr = ["webvr/googlevr"]
 oculusvr = ["webvr/oculusvr"]
-unstable = ["euclid/unstable", "layout_thread/unstable"]
+unstable = [
+    "euclid/unstable",
+    "layout_thread/unstable",
+    "msg/unstable",
+    "compositing/unstable"
+]
 
 [dependencies]
 bluetooth_traits = {path = "../bluetooth_traits"}