diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index 5906a28cb99..d6c1201106e 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -1009,7 +1009,6 @@ impl Window {
         self.reflow(ReflowGoal::ForScriptQuery,
                     ReflowQueryType::ContentBoxQuery(content_box_request),
                     ReflowReason::Query);
-        self.join_layout(); //FIXME: is this necessary, or is layout_rpc's mutex good enough?
         let ContentBoxResponse(rect) = self.layout_rpc.content_box();
         rect
     }
@@ -1018,7 +1017,6 @@ impl Window {
         self.reflow(ReflowGoal::ForScriptQuery,
                     ReflowQueryType::ContentBoxesQuery(content_boxes_request),
                     ReflowReason::Query);
-        self.join_layout(); //FIXME: is this necessary, or is layout_rpc's mutex good enough?
         let ContentBoxesResponse(rects) = self.layout_rpc.content_boxes();
         rects
     }