diff --git a/Point_set_processing_3/include/CGAL/mst_orient_normals.h b/Point_set_processing_3/include/CGAL/mst_orient_normals.h
index ca514afe76c..871105686cf 100644
--- a/Point_set_processing_3/include/CGAL/mst_orient_normals.h
+++ b/Point_set_processing_3/include/CGAL/mst_orient_normals.h
@@ -128,7 +128,8 @@ class Default_constrained_map
 public:
 
   typedef boost::readable_property_map_tag     category;
-  typedef typename ForwardIterator::value_type key_type;
+  typedef typename std::iterator_traits<
+            ForwardIterator>::value_type       key_type;
   typedef bool                                 value_type;
   typedef value_type                           reference;