diff --git a/src/components/script/dom/htmlcollection.rs b/src/components/script/dom/htmlcollection.rs
index 70a94b04f43..5d5f7de0ae0 100644
--- a/src/components/script/dom/htmlcollection.rs
+++ b/src/components/script/dom/htmlcollection.rs
@@ -26,7 +26,7 @@ impl<S: Encoder<E>, E> Encodable<S, E> for ~CollectionFilter {
 
 #[deriving(Encodable)]
 pub enum CollectionTypeId {
-    Static(~[JS<Element>]),
+    Static(Vec<JS<Element>>),
     Live(JS<Node>, ~CollectionFilter)
 }
 
@@ -135,6 +135,7 @@ impl HTMLCollection {
     pub fn Item(&self, index: u32) -> Option<JS<Element>> {
         match self.collection {
             Static(ref elems) => elems
+                .as_slice()
                 .get(index as uint)
                 .map(|elem| elem.clone()),
             Live(ref root, ref filter) => root.traverse_preorder()
diff --git a/src/components/script/dom/htmlformelement.rs b/src/components/script/dom/htmlformelement.rs
index c054d9232d9..bc04beabdb4 100644
--- a/src/components/script/dom/htmlformelement.rs
+++ b/src/components/script/dom/htmlformelement.rs
@@ -118,7 +118,7 @@ impl HTMLFormElement {
         // FIXME: https://github.com/mozilla/servo/issues/1844
         let doc = self.htmlelement.element.node.owner_doc();
         let doc = doc.get();
-        HTMLCollection::new(&doc.window, Static(~[]))
+        HTMLCollection::new(&doc.window, Static(vec!()))
     }
 
     pub fn Length(&self) -> i32 {
diff --git a/src/components/script/dom/htmlmapelement.rs b/src/components/script/dom/htmlmapelement.rs
index 8f853386473..24bab61040e 100644
--- a/src/components/script/dom/htmlmapelement.rs
+++ b/src/components/script/dom/htmlmapelement.rs
@@ -54,6 +54,6 @@ impl HTMLMapElement {
         // FIXME: https://github.com/mozilla/servo/issues/1845
         let doc = self.htmlelement.element.node.owner_doc();
         let doc = doc.get();
-        HTMLCollection::new(&doc.window, Static(~[]))
+        HTMLCollection::new(&doc.window, Static(vec!()))
     }
 }