diff --git a/src/components/script/dom/document.rs b/src/components/script/dom/document.rs
index 4df11e57754..08a0ee45763 100644
--- a/src/components/script/dom/document.rs
+++ b/src/components/script/dom/document.rs
@@ -92,7 +92,7 @@ pub struct Document {
     window: @mut Window,
     doctype: DocumentType,
     title: ~str,
-    idmap: HashMap<~str, AbstractNode<ScriptView>>
+    idmap: HashMap<DOMString, AbstractNode<ScriptView>>
 }
 
 impl Document {
@@ -326,7 +326,7 @@ impl Document {
     }
 
     pub fn register_nodes_with_id(&mut self, root: &AbstractNode<ScriptView>) {
-        foreach_ided_elements(root, |id: &~str, abstract_node: &AbstractNode<ScriptView>| {
+        foreach_ided_elements(root, |id: &DOMString, abstract_node: &AbstractNode<ScriptView>| {
             // TODO: "in tree order, within the context object's tree"
             // http://dom.spec.whatwg.org/#dom-document-getelementbyid.
             self.idmap.find_or_insert(id.clone(), *abstract_node);
@@ -334,7 +334,7 @@ impl Document {
     }
 
     pub fn unregister_nodes_with_id(&mut self, root: &AbstractNode<ScriptView>) {
-        foreach_ided_elements(root, |id: &~str, _| {
+        foreach_ided_elements(root, |id: &DOMString, _| {
             // TODO: "in tree order, within the context object's tree"
             // http://dom.spec.whatwg.org/#dom-document-getelementbyid.
             self.idmap.pop(id);
@@ -366,7 +366,7 @@ impl Document {
 
 #[inline(always)]
 fn foreach_ided_elements(root: &AbstractNode<ScriptView>,
-                         callback: &fn(&~str, &AbstractNode<ScriptView>)) {
+                         callback: &fn(&DOMString, &AbstractNode<ScriptView>)) {
     for node in root.traverse_preorder() {
         if !node.is_element() {
             continue;