--- boost/visit_each.hpp
+++ boost/visit_each.hpp
@@ -22,7 +22,7 @@
   template<typename Visitor, typename T>
   inline void visit_each(Visitor& visitor, const T& t)
   {
-    visit_each(visitor, t, 0);
+    visit_each(visitor, t, (long)0);
   }
 }