diff --git a/Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp b/Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp
index 5e49af73e1..3475940ec2 100644
--- a/Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp
+++ b/Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp
@@ -48,7 +48,7 @@ void DOMImplementation::visit_edges(Cell::Visitor& visitor)
 }
 
 // https://dom.spec.whatwg.org/#dom-domimplementation-createdocument
-WebIDL::ExceptionOr<JS::NonnullGCPtr<Document>> DOMImplementation::create_document(Optional<FlyString> const& namespace_, String const& qualified_name, JS::GCPtr<DocumentType> doctype) const
+WebIDL::ExceptionOr<JS::NonnullGCPtr<XMLDocument>> DOMImplementation::create_document(Optional<FlyString> const& namespace_, String const& qualified_name, JS::GCPtr<DocumentType> doctype) const
 {
     // 1. Let document be a new XMLDocument
     auto xml_document = XMLDocument::create(realm());
diff --git a/Userland/Libraries/LibWeb/DOM/DOMImplementation.h b/Userland/Libraries/LibWeb/DOM/DOMImplementation.h
index ab048a4daa..4c95321259 100644
--- a/Userland/Libraries/LibWeb/DOM/DOMImplementation.h
+++ b/Userland/Libraries/LibWeb/DOM/DOMImplementation.h
@@ -21,7 +21,7 @@ public:
     [[nodiscard]] static JS::NonnullGCPtr<DOMImplementation> create(Document&);
     virtual ~DOMImplementation();
 
-    WebIDL::ExceptionOr<JS::NonnullGCPtr<Document>> create_document(Optional<FlyString> const&, String const&, JS::GCPtr<DocumentType>) const;
+    WebIDL::ExceptionOr<JS::NonnullGCPtr<XMLDocument>> create_document(Optional<FlyString> const&, String const&, JS::GCPtr<DocumentType>) const;
     JS::NonnullGCPtr<Document> create_html_document(Optional<String> const& title) const;
     WebIDL::ExceptionOr<JS::NonnullGCPtr<DocumentType>> create_document_type(String const& qualified_name, String const& public_id, String const& system_id);
 
diff --git a/Userland/Libraries/LibWeb/DOM/DOMImplementation.idl b/Userland/Libraries/LibWeb/DOM/DOMImplementation.idl
index d30b107a72..0d7dd1d9be 100644
--- a/Userland/Libraries/LibWeb/DOM/DOMImplementation.idl
+++ b/Userland/Libraries/LibWeb/DOM/DOMImplementation.idl
@@ -1,11 +1,11 @@
 #import <DOM/Document.idl>
+#import <DOM/XMLDocument.idl>
 
 // https://dom.spec.whatwg.org/#domimplementation
 [Exposed=Window]
 interface DOMImplementation {
 
-    // FIXME: This should return XMLDocument instead of Document.
-    [NewObject] Document createDocument([FlyString] DOMString? namespace, [LegacyNullToEmptyString] DOMString qualifiedName, optional DocumentType? doctype = null);
+    [NewObject] XMLDocument createDocument([FlyString] DOMString? namespace, [LegacyNullToEmptyString] DOMString qualifiedName, optional DocumentType? doctype = null);
     [NewObject] Document createHTMLDocument(optional DOMString title);
     [NewObject] DocumentType createDocumentType(DOMString qualifiedName, DOMString publicId, DOMString systemId);