1 files changed, 7 insertions, 0 deletions
diff --git a/components/script/dom/bindings/trace.rs b/components/script/dom/bindings/trace.rs
index ab2b20b97c8..cdb2fd425ac 100644
--- a/components/script/dom/bindings/trace.rs
+++ b/components/script/dom/bindings/trace.rs
@@ -745,6 +745,7 @@ impl<'a, T: JSTraceable + 'static> Drop for RootedTraceable<'a, T> {
 /// If you have GC things like *mut JSObject or JSVal, use rooted!.
 /// If you have an arbitrary number of DomObjects to root, use rooted_vec!.
 /// If you know what you're doing, use this.
+#[allow_unrooted_interior]
 pub struct RootedTraceableBox<T: 'static + JSTraceable> {
     ptr: *mut T,
 }
@@ -768,6 +769,12 @@ impl<T: JSTraceable + 'static> RootedTraceableBox<T> {
     }
 }
 
+impl<T: JSTraceable + Default> Default for RootedTraceableBox<T> {
+    fn default() -> RootedTraceableBox<T> {
+        RootedTraceableBox::new(T::default())
+    }
+}
+
 impl<T: JSTraceable> Deref for RootedTraceableBox<T> {
     type Target = T;
     fn deref(&self) -> &T {