diff --git a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.cpp b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.cpp
index fd095e8ab2..6ee7eac56b 100644
--- a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.cpp
@@ -9,18 +9,18 @@
 
 namespace Web::HTML {
 
-WebIDL::ExceptionOr<JS::NonnullGCPtr<PageTransitionEvent>> PageTransitionEvent::create(JS::Realm& realm, DeprecatedFlyString const& event_name, PageTransitionEventInit const& event_init)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<PageTransitionEvent>> PageTransitionEvent::create(JS::Realm& realm, FlyString const& event_name, PageTransitionEventInit const& event_init)
 {
     return MUST_OR_THROW_OOM(realm.heap().allocate<PageTransitionEvent>(realm, realm, event_name, event_init));
 }
 
-WebIDL::ExceptionOr<JS::NonnullGCPtr<PageTransitionEvent>> PageTransitionEvent::construct_impl(JS::Realm& realm, DeprecatedFlyString const& event_name, PageTransitionEventInit const& event_init)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<PageTransitionEvent>> PageTransitionEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, PageTransitionEventInit const& event_init)
 {
     return create(realm, event_name, event_init);
 }
 
-PageTransitionEvent::PageTransitionEvent(JS::Realm& realm, DeprecatedFlyString const& event_name, PageTransitionEventInit const& event_init)
-    : DOM::Event(realm, event_name, event_init)
+PageTransitionEvent::PageTransitionEvent(JS::Realm& realm, FlyString const& event_name, PageTransitionEventInit const& event_init)
+    : DOM::Event(realm, event_name.to_deprecated_fly_string(), event_init)
     , m_persisted(event_init.persisted)
 {
 }
diff --git a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h
index ee23784b7b..a41eefa8d8 100644
--- a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h
@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <AK/FlyString.h>
 #include <LibWeb/DOM/Event.h>
 
 namespace Web::HTML {
@@ -18,10 +19,10 @@ class PageTransitionEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(PageTransitionEvent, DOM::Event);
 
 public:
-    static WebIDL::ExceptionOr<JS::NonnullGCPtr<PageTransitionEvent>> create(JS::Realm&, DeprecatedFlyString const& event_name, PageTransitionEventInit const& event_init);
-    static WebIDL::ExceptionOr<JS::NonnullGCPtr<PageTransitionEvent>> construct_impl(JS::Realm&, DeprecatedFlyString const& event_name, PageTransitionEventInit const& event_init);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<PageTransitionEvent>> create(JS::Realm&, FlyString const& event_name, PageTransitionEventInit const& event_init);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<PageTransitionEvent>> construct_impl(JS::Realm&, FlyString const& event_name, PageTransitionEventInit const& event_init);
 
-    PageTransitionEvent(JS::Realm&, DeprecatedFlyString const& event_name, PageTransitionEventInit const& event_init);
+    PageTransitionEvent(JS::Realm&, FlyString const& event_name, PageTransitionEventInit const& event_init);
 
     virtual ~PageTransitionEvent() override;
 
diff --git a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.idl b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.idl
index aba0f79320..b1f1ad56e5 100644
--- a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.idl
+++ b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.idl
@@ -1,7 +1,7 @@
 #import <DOM/Event.idl>
 
 // https://html.spec.whatwg.org/multipage/browsing-the-web.html#pagetransitionevent
-[Exposed=Window]
+[Exposed=Window, UseNewAKString]
 interface PageTransitionEvent : Event {
     constructor(DOMString type, optional PageTransitionEventInit eventInitDict = {});
 
diff --git a/Userland/Libraries/LibWeb/HTML/Window.cpp b/Userland/Libraries/LibWeb/HTML/Window.cpp
index ed465830be..b3c56fc364 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Window.cpp
@@ -793,7 +793,7 @@ void Window::fire_a_page_transition_event(DeprecatedFlyString const& event_name,
     // with the persisted attribute initialized to persisted,
     HTML::PageTransitionEventInit event_init {};
     event_init.persisted = persisted;
-    auto event = HTML::PageTransitionEvent::create(associated_document().realm(), event_name, event_init).release_value_but_fixme_should_propagate_errors();
+    auto event = HTML::PageTransitionEvent::create(associated_document().realm(), String::from_deprecated_string(event_name).release_value_but_fixme_should_propagate_errors(), event_init).release_value_but_fixme_should_propagate_errors();
 
     // ...the cancelable attribute initialized to true,
     event->set_cancelable(true);