diff --git a/Userland/Libraries/LibWeb/HTML/Navigable.cpp b/Userland/Libraries/LibWeb/HTML/Navigable.cpp
index bcee4dfa47..f26fb63ef9 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigable.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Navigable.cpp
@@ -133,10 +133,10 @@ void Navigable::set_container(JS::GCPtr<NavigableContainer> container)
 }
 
 // https://html.spec.whatwg.org/multipage/document-sequences.html#nav-traversable
-JS::GCPtr<TraversableNavigable> Navigable::traversable_navigable()
+JS::GCPtr<TraversableNavigable> Navigable::traversable_navigable() const
 {
     // 1. Let navigable be inputNavigable.
-    auto navigable = this;
+    auto navigable = const_cast<Navigable*>(this);
 
     // 2. While navigable is not a traversable navigable, set navigable to navigable's parent.
     while (navigable && !is<TraversableNavigable>(*navigable))
diff --git a/Userland/Libraries/LibWeb/HTML/Navigable.h b/Userland/Libraries/LibWeb/HTML/Navigable.h
index 9834465249..efabfed9d5 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigable.h
+++ b/Userland/Libraries/LibWeb/HTML/Navigable.h
@@ -45,7 +45,7 @@ public:
     JS::GCPtr<NavigableContainer> container() const;
     void set_container(JS::GCPtr<NavigableContainer>);
 
-    JS::GCPtr<TraversableNavigable> traversable_navigable();
+    JS::GCPtr<TraversableNavigable> traversable_navigable() const;
     JS::GCPtr<TraversableNavigable> top_level_traversable();
 
     static JS::GCPtr<Navigable> navigable_with_active_document(JS::NonnullGCPtr<DOM::Document>);