diff --git a/Libraries/LibJS/Runtime/MarkedValueList.cpp b/Libraries/LibJS/Runtime/MarkedValueList.cpp
index 58af575885..f268a21c6b 100644
--- a/Libraries/LibJS/Runtime/MarkedValueList.cpp
+++ b/Libraries/LibJS/Runtime/MarkedValueList.cpp
@@ -36,8 +36,8 @@ MarkedValueList::MarkedValueList(Heap& heap)
 }
 
 MarkedValueList::MarkedValueList(MarkedValueList&& other)
-    : m_heap(other.m_heap)
-    , m_values(move(other.m_values))
+    : AK::Vector<Value, 32>(move(static_cast<Vector<Value, 32>&>(other)))
+    , m_heap(other.m_heap)
 {
     m_heap.did_create_marked_value_list({}, *this);
 }
@@ -47,9 +47,4 @@ MarkedValueList::~MarkedValueList()
     m_heap.did_destroy_marked_value_list({}, *this);
 }
 
-void MarkedValueList::append(Value value)
-{
-    m_values.append(value);
-}
-
 }
diff --git a/Libraries/LibJS/Runtime/MarkedValueList.h b/Libraries/LibJS/Runtime/MarkedValueList.h
index d9c262ed65..e311972181 100644
--- a/Libraries/LibJS/Runtime/MarkedValueList.h
+++ b/Libraries/LibJS/Runtime/MarkedValueList.h
@@ -33,7 +33,7 @@
 
 namespace JS {
 
-class MarkedValueList {
+class MarkedValueList : public AK::Vector<Value, 32> {
     AK_MAKE_NONCOPYABLE(MarkedValueList);
 
 public:
@@ -43,16 +43,16 @@ public:
 
     MarkedValueList& operator=(MarkedValueList&&) = delete;
 
-    bool is_empty() const { return m_values.is_empty(); }
-    size_t size() const { return m_values.size(); }
-    void clear() { m_values.clear(); }
-    Vector<Value, 32>& values() { return m_values; }
+    Vector<Value, 32>& values() { return *this; }
 
-    void append(Value);
+    MarkedValueList copy() const
+    {
+        MarkedValueList copy { m_heap };
+        copy.append(*this);
+        return copy;
+    }
 
 private:
     Heap& m_heap;
-    Vector<Value, 32> m_values;
 };
-
 }