1 files changed, 5 insertions, 2 deletions
diff --git a/components/script/dom/mutationobserver.rs b/components/script/dom/mutationobserver.rs
index 6f870c3bc48..bd5c77d3ec9 100644
--- a/components/script/dom/mutationobserver.rs
+++ b/components/script/dom/mutationobserver.rs
@@ -22,6 +22,7 @@ use crate::dom::mutationrecord::MutationRecord;
 use crate::dom::node::{Node, ShadowIncluding};
 use crate::dom::window::Window;
 use crate::microtask::Microtask;
+use crate::script_runtime::CanGc;
 use crate::script_thread::ScriptThread;
 
 #[dom_struct]
@@ -72,9 +73,10 @@ impl MutationObserver {
         global: &Window,
         proto: Option<HandleObject>,
         callback: Rc<MutationCallback>,
+        can_gc: CanGc,
     ) -> DomRoot<MutationObserver> {
         let boxed_observer = Box::new(MutationObserver::new_inherited(callback));
-        reflect_dom_object_with_proto(boxed_observer, global, proto)
+        reflect_dom_object_with_proto(boxed_observer, global, proto, can_gc)
     }
 
     fn new_inherited(callback: Rc<MutationCallback>) -> MutationObserver {
@@ -90,10 +92,11 @@ impl MutationObserver {
     pub fn Constructor(
         global: &Window,
         proto: Option<HandleObject>,
+        can_gc: CanGc,
         callback: Rc<MutationCallback>,
     ) -> Fallible<DomRoot<MutationObserver>> {
         global.set_exists_mut_observer();
-        let observer = MutationObserver::new_with_proto(global, proto, callback);
+        let observer = MutationObserver::new_with_proto(global, proto, callback, can_gc);
         ScriptThread::add_mutation_observer(&observer);
         Ok(observer)
     }