Index: boost/enable_shared_from_this.hpp
===================================================================
--- boost/enable_shared_from_this.hpp	(revision 44730)
+++ boost/enable_shared_from_this.hpp	(working copy)
@@ -29,8 +29,7 @@
     {
         if( !owned() && _internal_shared_count.empty() )
         {
-            T * p = dynamic_cast<T *>(const_cast<enable_shared_from_this*>(this));
-            detail::shared_count( p, detail::sp_deleter_wrapper() ).swap(_internal_shared_count);
+            detail::shared_count( (void*)0, detail::sp_deleter_wrapper() ).swap(_internal_shared_count);
             _internal_weak_count = _internal_shared_count;
         }
     }