diff --git a/src/components/script/dom/characterdata.rs b/src/components/script/dom/characterdata.rs
index dc83f3b90c9..9ae21154cfb 100644
--- a/src/components/script/dom/characterdata.rs
+++ b/src/components/script/dom/characterdata.rs
@@ -7,7 +7,7 @@
 use dom::bindings::codegen::InheritTypes::{CharacterDataDerived, NodeCast};
 use dom::bindings::error::{Fallible, ErrorResult, IndexSize};
 use dom::bindings::js::JSRef;
-use dom::bindings::trace::Untraceable;
+use dom::bindings::trace::Traceable;
 use dom::bindings::utils::{Reflectable, Reflector};
 use dom::document::Document;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
@@ -19,7 +19,7 @@ use std::cell::RefCell;
 #[deriving(Encodable)]
 pub struct CharacterData {
     pub node: Node,
-    pub data: Untraceable<RefCell<DOMString>>,
+    pub data: Traceable<RefCell<DOMString>>,
 }
 
 impl CharacterDataDerived for EventTarget {
@@ -37,7 +37,7 @@ impl CharacterData {
     pub fn new_inherited(id: NodeTypeId, data: DOMString, document: &JSRef<Document>) -> CharacterData {
         CharacterData {
             node: Node::new_inherited(id, document),
-            data: Untraceable::new(RefCell::new(data)),
+            data: Traceable::new(RefCell::new(data)),
         }
     }
 }
diff --git a/src/components/script/dom/document.rs b/src/components/script/dom/document.rs
index 91b5759b95e..137cd15e58e 100644
--- a/src/components/script/dom/document.rs
+++ b/src/components/script/dom/document.rs
@@ -66,7 +66,7 @@ pub struct Document {
     idmap: Traceable<RefCell<HashMap<DOMString, Vec<JS<Element>>>>>,
     pub implementation: Cell<Option<JS<DOMImplementation>>>,
     pub content_type: DOMString,
-    pub encoding_name: Untraceable<RefCell<DOMString>>,
+    pub encoding_name: Traceable<RefCell<DOMString>>,
     pub is_html_document: bool,
     pub url: Untraceable<Url>,
     pub quirks_mode: Untraceable<Cell<QuirksMode>>,
@@ -231,7 +231,7 @@ impl Document {
             // http://dom.spec.whatwg.org/#concept-document-quirks
             quirks_mode: Untraceable::new(Cell::new(NoQuirks)),
             // http://dom.spec.whatwg.org/#concept-document-encoding
-            encoding_name: Untraceable::new(RefCell::new("utf-8".to_string())),
+            encoding_name: Traceable::new(RefCell::new("utf-8".to_string())),
             is_html_document: is_html_document == HTMLDocument,
         }
     }
diff --git a/src/components/script/dom/event.rs b/src/components/script/dom/event.rs
index 8d7dadc86b3..213aaa10e46 100644
--- a/src/components/script/dom/event.rs
+++ b/src/components/script/dom/event.rs
@@ -6,7 +6,7 @@ use dom::bindings::codegen::Bindings::EventBinding;
 use dom::bindings::codegen::Bindings::EventBinding::EventConstants;
 use dom::bindings::error::Fallible;
 use dom::bindings::js::{JS, JSRef, Temporary};
-use dom::bindings::trace::Untraceable;
+use dom::bindings::trace::Traceable;
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::eventtarget::EventTarget;
 use dom::window::Window;
@@ -52,16 +52,16 @@ pub struct Event {
     pub reflector_: Reflector,
     pub current_target: Cell<Option<JS<EventTarget>>>,
     pub target: Cell<Option<JS<EventTarget>>>,
-    type_: Untraceable<RefCell<DOMString>>,
-    pub phase: Untraceable<Cell<EventPhase>>,
-    pub canceled: Untraceable<Cell<bool>>,
-    pub stop_propagation: Untraceable<Cell<bool>>,
-    pub stop_immediate: Untraceable<Cell<bool>>,
-    pub cancelable: Untraceable<Cell<bool>>,
-    pub bubbles: Untraceable<Cell<bool>>,
-    pub trusted: Untraceable<Cell<bool>>,
-    pub dispatching: Untraceable<Cell<bool>>,
-    pub initialized: Untraceable<Cell<bool>>,
+    type_: Traceable<RefCell<DOMString>>,
+    pub phase: Traceable<Cell<EventPhase>>,
+    pub canceled: Traceable<Cell<bool>>,
+    pub stop_propagation: Traceable<Cell<bool>>,
+    pub stop_immediate: Traceable<Cell<bool>>,
+    pub cancelable: Traceable<Cell<bool>>,
+    pub bubbles: Traceable<Cell<bool>>,
+    pub trusted: Traceable<Cell<bool>>,
+    pub dispatching: Traceable<Cell<bool>>,
+    pub initialized: Traceable<Cell<bool>>,
     pub timestamp: u64,
 }
 
@@ -72,16 +72,16 @@ impl Event {
             reflector_: Reflector::new(),
             current_target: Cell::new(None),
             target: Cell::new(None),
-            phase: Untraceable::new(Cell::new(PhaseNone)),
-            type_: Untraceable::new(RefCell::new("".to_string())),
-            canceled: Untraceable::new(Cell::new(false)),
-            cancelable: Untraceable::new(Cell::new(true)),
-            bubbles: Untraceable::new(Cell::new(false)),
-            trusted: Untraceable::new(Cell::new(false)),
-            dispatching: Untraceable::new(Cell::new(false)),
-            stop_propagation: Untraceable::new(Cell::new(false)),
-            stop_immediate: Untraceable::new(Cell::new(false)),
-            initialized: Untraceable::new(Cell::new(false)),
+            phase: Traceable::new(Cell::new(PhaseNone)),
+            type_: Traceable::new(RefCell::new("".to_string())),
+            canceled: Traceable::new(Cell::new(false)),
+            cancelable: Traceable::new(Cell::new(true)),
+            bubbles: Traceable::new(Cell::new(false)),
+            trusted: Traceable::new(Cell::new(false)),
+            dispatching: Traceable::new(Cell::new(false)),
+            stop_propagation: Traceable::new(Cell::new(false)),
+            stop_immediate: Traceable::new(Cell::new(false)),
+            initialized: Traceable::new(Cell::new(false)),
             timestamp: time::get_time().sec as u64,
         }
     }
diff --git a/src/components/script/dom/uievent.rs b/src/components/script/dom/uievent.rs
index 745b05260bc..38084d62c37 100644
--- a/src/components/script/dom/uievent.rs
+++ b/src/components/script/dom/uievent.rs
@@ -6,7 +6,7 @@ use dom::bindings::codegen::Bindings::UIEventBinding;
 use dom::bindings::codegen::InheritTypes::{EventCast, UIEventDerived};
 use dom::bindings::error::Fallible;
 use dom::bindings::js::{JS, JSRef, RootedReference, Temporary, OptionalSettable};
-use dom::bindings::trace::Untraceable;
+use dom::bindings::trace::Traceable;
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
 use dom::event::{Event, EventMethods, EventTypeId, UIEventTypeId};
 use dom::window::Window;
@@ -19,7 +19,7 @@ use std::cell::Cell;
 pub struct UIEvent {
     pub event: Event,
     pub view: Cell<Option<JS<Window>>>,
-    pub detail: Untraceable<Cell<i32>>
+    pub detail: Traceable<Cell<i32>>
 }
 
 impl UIEventDerived for Event {
@@ -33,7 +33,7 @@ impl UIEvent {
         UIEvent {
             event: Event::new_inherited(type_id),
             view: Cell::new(None),
-            detail: Untraceable::new(Cell::new(0)),
+            detail: Traceable::new(Cell::new(0)),
         }
     }
 
diff --git a/src/components/script/dom/window.rs b/src/components/script/dom/window.rs
index 2cd1dd68c18..92cb313eca8 100644
--- a/src/components/script/dom/window.rs
+++ b/src/components/script/dom/window.rs
@@ -75,7 +75,7 @@ pub struct Window {
     pub navigator: Cell<Option<JS<Navigator>>>,
     pub image_cache_task: ImageCacheTask,
     pub active_timers: Traceable<RefCell<HashMap<TimerId, TimerHandle>>>,
-    pub next_timer_handle: Untraceable<Cell<i32>>,
+    pub next_timer_handle: Traceable<Cell<i32>>,
     pub compositor: Untraceable<Box<ScriptListener>>,
     pub browser_context: Traceable<RefCell<Option<BrowserContext>>>,
     pub page: Rc<Page>,
@@ -399,7 +399,7 @@ impl Window {
             navigator: Cell::new(None),
             image_cache_task: image_cache_task,
             active_timers: Traceable::new(RefCell::new(HashMap::new())),
-            next_timer_handle: Untraceable::new(Cell::new(0)),
+            next_timer_handle: Traceable::new(Cell::new(0)),
             browser_context: Traceable::new(RefCell::new(None)),
             performance: Cell::new(None),
             navigationStart: time::get_time().sec as u64,