diff --git a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.cpp b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.cpp
index 9329dbf0b31..17dd435ed98 100644
--- a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.cpp
@@ -24,7 +24,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<PromiseRejectionEvent>> PromiseRejectionEve
 
 PromiseRejectionEvent::PromiseRejectionEvent(JS::Realm& realm, FlyString const& event_name, PromiseRejectionEventInit const& event_init)
     : DOM::Event(realm, event_name, event_init)
-    , m_promise(const_cast<JS::Promise*>(event_init.promise.cell()))
+    , m_promise(*event_init.promise)
     , m_reason(event_init.reason)
 {
 }
diff --git a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.h b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.h
index a4ca47aa1a1..b0c1ab856db 100644
--- a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.h
@@ -16,7 +16,7 @@
 namespace Web::HTML {
 
 struct PromiseRejectionEventInit : public DOM::EventInit {
-    JS::Handle<JS::Promise> promise;
+    JS::Handle<JS::Object> promise;
     JS::Value reason;
 };
 
@@ -31,7 +31,7 @@ public:
     virtual ~PromiseRejectionEvent() override;
 
     // Needs to return a pointer for the generated JS bindings to work.
-    JS::Promise const* promise() const { return m_promise; }
+    JS::Object const* promise() const { return m_promise; }
     JS::Value reason() const { return m_reason; }
 
 private:
@@ -40,7 +40,7 @@ private:
     virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
-    JS::GCPtr<JS::Promise> m_promise;
+    JS::NonnullGCPtr<JS::Object> m_promise;
     JS::Value m_reason;
 };
 
diff --git a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.idl b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.idl
index 01c2dce8087..a76a5074cbb 100644
--- a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.idl
+++ b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.idl
@@ -1,15 +1,15 @@
 #import <DOM/Event.idl>
 
-// https://html.spec.whatwg.org/#promiserejectionevent
-[Exposed=(Window,Worker)]
+// https://html.spec.whatwg.org/multipage/webappapis.html#promiserejectionevent
+[Exposed=*]
 interface PromiseRejectionEvent : Event {
     constructor(DOMString type, PromiseRejectionEventInit eventInitDict);
 
-    readonly attribute Promise<any> promise;
+    readonly attribute object promise;
     readonly attribute any reason;
 };
 
 dictionary PromiseRejectionEventInit : EventInit {
-    required Promise<any> promise;
+    required object promise;
     any reason;
 };