diff --git a/components/compositing/constellation.rs b/components/compositing/constellation.rs
index 6bffd1039c3..2daa652f6f4 100644
--- a/components/compositing/constellation.rs
+++ b/components/compositing/constellation.rs
@@ -28,7 +28,7 @@ use ipc_channel::router::ROUTER;
 use layout_traits::{LayoutControlChan, LayoutThreadFactory};
 use msg::constellation_msg::AnimationState;
 use msg::constellation_msg::WebDriverCommandMsg;
-use msg::constellation_msg::{DocumentState, FrameId, PipelineId};
+use msg::constellation_msg::{FrameId, PipelineId};
 use msg::constellation_msg::{Key, KeyModifiers, KeyState, LoadData};
 use msg::constellation_msg::{MozBrowserEvent, NavigationDirection};
 use msg::constellation_msg::{PipelineNamespace, PipelineNamespaceId};
@@ -43,7 +43,7 @@ use pipeline::{CompositionPipeline, InitialPipelineState, Pipeline, Unprivileged
 use profile_traits::mem;
 use profile_traits::time;
 use sandboxing;
-use script_traits::{CompositorEvent, ConstellationControlMsg, LayoutControlMsg};
+use script_traits::{CompositorEvent, ConstellationControlMsg, DocumentState, LayoutControlMsg};
 use script_traits::{IFrameLoadInfo, IFrameSandboxState};
 use script_traits::{LayoutMsg as FromLayoutMsg, ScriptMsg as FromScriptMsg, ScriptThreadFactory};
 use script_traits::{TimerEventRequest};
diff --git a/components/msg/constellation_msg.rs b/components/msg/constellation_msg.rs
index 922785b7e25..d1e9b39b02b 100644
--- a/components/msg/constellation_msg.rs
+++ b/components/msg/constellation_msg.rs
@@ -219,15 +219,6 @@ pub enum AnimationState {
     NoAnimationCallbacksPresent,
 }
 
-/// Used to determine if a script has any pending asynchronous activity.
-#[derive(Copy, Clone, Debug, PartialEq, Deserialize, Serialize)]
-pub enum DocumentState {
-    /// The document has been loaded and is idle.
-    Idle,
-    /// The document is either loading or waiting on an event.
-    Pending,
-}
-
 // https://developer.mozilla.org/en-US/docs/Web/API/Using_the_Browser_API#Events
 #[derive(Deserialize, Serialize)]
 pub enum MozBrowserEvent {
diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index 382007a2dec..8ae52b9ccb0 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -43,7 +43,7 @@ use js::rust::Runtime;
 use layout_interface::{ContentBoxResponse, ContentBoxesResponse, ResolvedStyleResponse, ScriptReflow};
 use layout_interface::{LayoutChan, LayoutRPC, Msg, Reflow, ReflowQueryType};
 use libc;
-use msg::constellation_msg::{ConstellationChan, DocumentState, LoadData};
+use msg::constellation_msg::{ConstellationChan, LoadData};
 use msg::constellation_msg::{MozBrowserEvent, PipelineId, SubpageId, WindowSizeData};
 use msg::webdriver_msg::{WebDriverJSError, WebDriverJSResult};
 use net_traits::ResourceThread;
@@ -58,7 +58,8 @@ use script_thread::{DOMManipulationThreadSource, UserInteractionThreadSource, Ne
 use script_thread::{HistoryTraversalThreadSource, FileReadingThreadSource, SendableMainThreadScriptChan};
 use script_thread::{ScriptChan, ScriptPort, MainThreadScriptChan, MainThreadScriptMsg, RunnableWrapper};
 use script_traits::ScriptMsg as ConstellationMsg;
-use script_traits::{MsDuration, ScriptToCompositorMsg, TimerEvent, TimerEventId, TimerEventRequest, TimerSource};
+use script_traits::{DocumentState, MsDuration, ScriptToCompositorMsg, TimerEvent, TimerEventId};
+use script_traits::{TimerEventRequest, TimerSource};
 use selectors::parser::PseudoElement;
 use std::ascii::AsciiExt;
 use std::borrow::ToOwned;
diff --git a/components/script_traits/lib.rs b/components/script_traits/lib.rs
index fa27f37bd23..64e64e64ed9 100644
--- a/components/script_traits/lib.rs
+++ b/components/script_traits/lib.rs
@@ -147,6 +147,15 @@ pub enum ConstellationControlMsg {
     ReportCSSError(PipelineId, String, u32, u32, String),
 }
 
+/// Used to determine if a script has any pending asynchronous activity.
+#[derive(Copy, Clone, Debug, PartialEq, Deserialize, Serialize)]
+pub enum DocumentState {
+    /// The document has been loaded and is idle.
+    Idle,
+    /// The document is either loading or waiting on an event.
+    Pending,
+}
+
 /// The type of input represented by a multi-touch event.
 #[derive(Clone, Copy, Debug, Deserialize, Serialize)]
 pub enum TouchEventType {
diff --git a/components/script_traits/script_msg.rs b/components/script_traits/script_msg.rs
index 5d392f016c8..195976806a6 100644
--- a/components/script_traits/script_msg.rs
+++ b/components/script_traits/script_msg.rs
@@ -2,13 +2,14 @@
  * 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/. */
 
+use DocumentState;
 use IFrameLoadInfo;
 use MouseEventType;
 use canvas_traits::CanvasMsg;
 use euclid::point::Point2D;
 use euclid::size::Size2D;
 use ipc_channel::ipc::IpcSender;
-use msg::constellation_msg::{AnimationState, DocumentState, NavigationDirection};
+use msg::constellation_msg::{AnimationState, NavigationDirection};
 use msg::constellation_msg::{Failure, MozBrowserEvent, PipelineId};
 use msg::constellation_msg::{LoadData, MouseButton, SubpageId};
 use offscreen_gl_context::GLContextAttributes;