diff --git a/components/compositing/compositor_layer.rs b/components/compositing/compositor_layer.rs
index 470f70e7acfd..9c7d567c43aa 100644
--- a/components/compositing/compositor_layer.rs
+++ b/components/compositing/compositor_layer.rs
@@ -12,10 +12,11 @@ use gfx_traits::{Epoch, LayerId, LayerProperties, ScrollPolicy};
 use layers::color::Color;
 use layers::geometry::LayerPixel;
 use layers::layers::{Layer, LayerBufferSet};
-use msg::constellation_msg::{MouseEventType, PipelineId};
+use msg::constellation_msg::PipelineId;
 use script_traits::CompositorEvent;
 use script_traits::CompositorEvent::{MouseButtonEvent, MouseMoveEvent};
 use script_traits::ConstellationControlMsg;
+use script_traits::MouseEventType;
 use std::rc::Rc;
 use windowing::{MouseWindowEvent, WindowMethods};
 
@@ -519,4 +520,3 @@ impl RcCompositorLayer for Rc<Layer<CompositorData>> {
                                         None);
     }
 }
-
diff --git a/components/msg/constellation_msg.rs b/components/msg/constellation_msg.rs
index c6d2f65378cb..922785b7e254 100644
--- a/components/msg/constellation_msg.rs
+++ b/components/msg/constellation_msg.rs
@@ -200,13 +200,6 @@ bitflags! {
     }
 }
 
-#[derive(Deserialize, HeapSizeOf, Serialize)]
-pub enum MouseEventType {
-    Click,
-    MouseDown,
-    MouseUp,
-}
-
 /// The mouse button involved in the event.
 #[derive(Clone, Copy, Debug, Deserialize, Serialize)]
 pub enum MouseButton {
diff --git a/components/script/dom/document.rs b/components/script/dom/document.rs
index 8a3b0c3a7762..604c09a3b2c0 100644
--- a/components/script/dom/document.rs
+++ b/components/script/dom/document.rs
@@ -83,12 +83,13 @@ use layout_interface::{LayoutChan, Msg, ReflowQueryType};
 use msg::constellation_msg::{ALT, CONTROL, SHIFT, SUPER};
 use msg::constellation_msg::{AnimationState, PipelineId};
 use msg::constellation_msg::{ConstellationChan, Key, KeyModifiers, KeyState};
-use msg::constellation_msg::{MouseButton, MouseEventType, MozBrowserEvent, SubpageId};
+use msg::constellation_msg::{MouseButton, MozBrowserEvent, SubpageId};
 use net_traits::ControlMsg::{GetCookiesForUrl, SetCookiesForUrl};
 use net_traits::CookieSource::NonHTTP;
 use net_traits::{AsyncResponseTarget, PendingAsyncLoad};
 use num::ToPrimitive;
 use script_thread::{MainThreadScriptMsg, Runnable};
+use script_traits::MouseEventType;
 use script_traits::{ScriptMsg as ConstellationMsg, ScriptToCompositorMsg};
 use script_traits::{TouchEventType, TouchId, UntrustedNodeAddress};
 use std::ascii::AsciiExt;
diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index 29793e1383a0..3e397f2b5f9e 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -64,7 +64,7 @@ use layout_interface::{self, LayoutChan, NewLayoutThreadInfo, ScriptLayoutChan};
 use libc;
 use mem::heap_size_of_self_and_children;
 use msg::constellation_msg::{ConstellationChan, LoadData};
-use msg::constellation_msg::{MouseButton, MouseEventType, MozBrowserEvent, PipelineId};
+use msg::constellation_msg::{MouseButton, MozBrowserEvent, PipelineId};
 use msg::constellation_msg::{PipelineNamespace};
 use msg::constellation_msg::{SubpageId, WindowSizeData};
 use msg::webdriver_msg::WebDriverScriptCommand;
@@ -80,7 +80,8 @@ use profile_traits::mem::{self, OpaqueSender, Report, ReportKind, ReportsChan};
 use profile_traits::time::{self, ProfilerCategory, profile};
 use script_traits::CompositorEvent::{KeyEvent, MouseButtonEvent, MouseMoveEvent, ResizeEvent};
 use script_traits::CompositorEvent::{TouchEvent};
-use script_traits::{CompositorEvent, ConstellationControlMsg, EventResult, InitialScriptState, NewLayoutInfo};
+use script_traits::{CompositorEvent, ConstellationControlMsg, EventResult};
+use script_traits::{InitialScriptState, MouseEventType, NewLayoutInfo};
 use script_traits::{LayoutMsg, OpaqueScriptLayoutChannel, ScriptMsg as ConstellationMsg};
 use script_traits::{ScriptThreadFactory, ScriptToCompositorMsg, TimerEvent, TimerEventRequest, TimerSource};
 use script_traits::{TouchEventType, TouchId};
diff --git a/components/script_traits/lib.rs b/components/script_traits/lib.rs
index 4a84c7b71f37..fa27f37bd23d 100644
--- a/components/script_traits/lib.rs
+++ b/components/script_traits/lib.rs
@@ -40,9 +40,8 @@ use gfx_traits::LayerId;
 use ipc_channel::ipc::{IpcReceiver, IpcSender};
 use libc::c_void;
 use msg::constellation_msg::{ConstellationChan, Failure, PipelineId, WindowSizeData};
-use msg::constellation_msg::{Key, KeyModifiers, KeyState, LoadData, SubpageId};
-use msg::constellation_msg::{MouseButton, MouseEventType};
-use msg::constellation_msg::{MozBrowserEvent, PipelineNamespaceId};
+use msg::constellation_msg::{Key, KeyModifiers, KeyState, LoadData, MouseButton};
+use msg::constellation_msg::{MozBrowserEvent, PipelineNamespaceId, SubpageId};
 use msg::webdriver_msg::WebDriverScriptCommand;
 use net_traits::ResourceThread;
 use net_traits::image_cache_thread::ImageCacheThread;
@@ -167,6 +166,17 @@ pub enum TouchEventType {
 #[derive(Clone, Copy, Debug, Eq, PartialEq, Deserialize, Serialize)]
 pub struct TouchId(pub i32);
 
+/// The types of mouse events
+#[derive(Deserialize, HeapSizeOf, Serialize)]
+pub enum MouseEventType {
+    /// Mouse button clicked
+    Click,
+    /// Mouse button down
+    MouseDown,
+    /// Mouse button up
+    MouseUp,
+}
+
 /// Events from the compositor that the script thread needs to know about
 #[derive(Deserialize, Serialize)]
 pub enum CompositorEvent {
diff --git a/components/script_traits/script_msg.rs b/components/script_traits/script_msg.rs
index e88605e66ea5..5d392f016c8f 100644
--- a/components/script_traits/script_msg.rs
+++ b/components/script_traits/script_msg.rs
@@ -3,14 +3,14 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 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::{Failure, MozBrowserEvent, PipelineId};
-use msg::constellation_msg::{LoadData, SubpageId};
-use msg::constellation_msg::{MouseButton, MouseEventType};
+use msg::constellation_msg::{LoadData, MouseButton, SubpageId};
 use offscreen_gl_context::GLContextAttributes;
 use style_traits::viewport::ViewportConstraints;
 use url::Url;