diff --git a/include/osg/Callback b/include/osg/Callback
index 93cb61600..30cd1aa6f 100644
--- a/include/osg/Callback
+++ b/include/osg/Callback
@@ -312,6 +312,9 @@ public:
 
     META_Object(osg,DrawableEventCallback);
 
+    virtual DrawableEventCallback* asDrawableEventCallback() { return this; }
+    virtual const DrawableEventCallback* asDrawableEventCallback() const { return this; }
+
     /** override Callback::run() entry point to adapt to StateAttributeCallback::run(..) method.*/
     virtual bool run(osg::Object* object, osg::Object* data);
 
@@ -328,6 +331,9 @@ public:
 
     META_Object(osg,DrawableCullCallback);
 
+    virtual DrawableCullCallback* asDrawableCullCallback() { return this; }
+    virtual const DrawableCullCallback* asDrawableCullCallback() const { return this; }
+
     // just use the standard run implementation to passes run onto any nested callbacks.
     using Callback::run;