diff --git a/components/script/dom/document.rs b/components/script/dom/document.rs
index 8e1f47d4eee..888796dcaee 100644
--- a/components/script/dom/document.rs
+++ b/components/script/dom/document.rs
@@ -220,6 +220,7 @@ impl<'a> DocumentHelpers<'a> for JSRef<'a, Document> {
         match mode {
             Quirks => {
                 let window = self.window.root();
+                let window = window.r();
                 let LayoutChan(ref layout_chan) = window.page().layout_chan;
                 layout_chan.send(Msg::SetQuirksMode);
             }