diff --git a/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp b/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp
index d61fe9da0a..69879bd5a8 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp
+++ b/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp
@@ -77,8 +77,10 @@ Element* HTMLCollection::item(size_t index) const
 }
 
 // https://dom.spec.whatwg.org/#dom-htmlcollection-nameditem-key
-Element* HTMLCollection::named_item(DeprecatedFlyString const& name) const
+Element* HTMLCollection::named_item(FlyString const& name_) const
 {
+    auto name = name_.to_deprecated_fly_string();
+
     // 1. If key is the empty string, return null.
     if (name.is_empty())
         return nullptr;
@@ -147,7 +149,7 @@ WebIDL::ExceptionOr<JS::Value> HTMLCollection::item_value(size_t index) const
 
 WebIDL::ExceptionOr<JS::Value> HTMLCollection::named_item_value(DeprecatedFlyString const& index) const
 {
-    auto* element = named_item(index);
+    auto* element = named_item(FlyString::from_deprecated_fly_string(index).release_value());
     if (!element)
         return JS::js_undefined();
     return const_cast<Element*>(element);
diff --git a/Userland/Libraries/LibWeb/DOM/HTMLCollection.h b/Userland/Libraries/LibWeb/DOM/HTMLCollection.h
index 4d1d332525..1e9185078f 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLCollection.h
+++ b/Userland/Libraries/LibWeb/DOM/HTMLCollection.h
@@ -40,7 +40,7 @@ public:
 
     size_t length() const;
     Element* item(size_t index) const;
-    Element* named_item(DeprecatedFlyString const& name) const;
+    Element* named_item(FlyString const& name) const;
 
     JS::MarkedVector<Element*> collect_matching_elements() const;
 
diff --git a/Userland/Libraries/LibWeb/DOM/HTMLCollection.idl b/Userland/Libraries/LibWeb/DOM/HTMLCollection.idl
index 0bcf02221c..806a3a5048 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLCollection.idl
+++ b/Userland/Libraries/LibWeb/DOM/HTMLCollection.idl
@@ -1,6 +1,6 @@
 #import <DOM/Element.idl>
 
-[Exposed=Window, LegacyUnenumerableNamedProperties]
+[Exposed=Window, LegacyUnenumerableNamedProperties, UseNewAKString]
 interface HTMLCollection {
 
     readonly attribute unsigned long length;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
index 022c7d78d9..b2fc037e15 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
@@ -65,7 +65,7 @@ DOM::Element* HTMLSelectElement::item(size_t index)
 DOM::Element* HTMLSelectElement::named_item(DeprecatedFlyString const& name)
 {
     // The namedItem(name) method must return the value returned by the method of the same name on the options collection, when invoked with the same argument.
-    return const_cast<HTMLOptionsCollection&>(*options()).named_item(name);
+    return const_cast<HTMLOptionsCollection&>(*options()).named_item(FlyString::from_deprecated_fly_string(name).release_value());
 }
 
 // https://html.spec.whatwg.org/multipage/form-elements.html#dom-select-add