diff --git a/src/components/main/compositing/quadtree.rs b/src/components/main/compositing/quadtree.rs
index e7d677e474a..1741de6c8ca 100644
--- a/src/components/main/compositing/quadtree.rs
+++ b/src/components/main/compositing/quadtree.rs
@@ -596,7 +596,6 @@ impl<T: Tile> QuadtreeNode<T> {
             };
 
             delta = delta + c_delta;
-            // This was a ~[] = ~[] + ~[] which copies. I think this is the equivalent operation.
             request.push_all(c_request.as_slice());
             unused.push_all_move(c_unused);
         }
diff --git a/src/components/main/layout/floats.rs b/src/components/main/layout/floats.rs
index fc1d6bafe89..3144629f405 100644
--- a/src/components/main/layout/floats.rs
+++ b/src/components/main/layout/floats.rs
@@ -50,7 +50,7 @@ struct Float {
 #[deriving(Clone)]
 struct FloatList {
     /// Information about each of the floats here.
-    floats: ~[Float],
+    floats: Vec<Float>,
     /// Cached copy of the maximum top offset of the float.
     max_top: Au,
 }
@@ -58,7 +58,7 @@ struct FloatList {
 impl FloatList {
     fn new() -> FloatList {
         FloatList {
-            floats: ~[],
+            floats: Vec::new(),
             max_top: Au(0),
         }
     }