1 files changed, 3 insertions, 0 deletions
diff --git a/WebCore/bindings/v8/V8DOMMap.h b/WebCore/bindings/v8/V8DOMMap.h
index d42daa4..a7e03a0 100644
--- a/WebCore/bindings/v8/V8DOMMap.h
+++ b/WebCore/bindings/v8/V8DOMMap.h
@@ -44,10 +44,13 @@ namespace WebCore {
     template <class KeyType, class ValueType> class AbstractWeakReferenceMap {
     public:
         AbstractWeakReferenceMap(v8::WeakReferenceCallback callback) : m_weakReferenceCallback(callback) { }
+        virtual ~AbstractWeakReferenceMap() { }
 
         class Visitor {
         public:
             virtual void visitDOMWrapper(KeyType* key, v8::Persistent<ValueType> object) = 0;
+        protected:
+            virtual ~Visitor() { }
         };
 
         virtual v8::Persistent<ValueType> get(KeyType* obj) = 0;