diff --git a/BGL/include/CGAL/boost/graph/helpers.h b/BGL/include/CGAL/boost/graph/helpers.h
index 867b6c2fe5b..a054d76cf95 100644
--- a/BGL/include/CGAL/boost/graph/helpers.h
+++ b/BGL/include/CGAL/boost/graph/helpers.h
@@ -249,7 +249,7 @@ template <typename FaceGraph>
 template <typename FaceGraph>
 bool is_tetrahedron( typename boost::graph_traits<FaceGraph>::halfedge_descriptor hd, const FaceGraph& g)   
 {
-  typedef boost::graph_traits<FaceGraph>::halfedge_descriptor halfedge_descriptor;
+  typedef typename boost::graph_traits<FaceGraph>::halfedge_descriptor halfedge_descriptor;
 
   halfedge_descriptor h1 = hd;
   if(is_border(h1,g)) return false;
@@ -293,7 +293,7 @@ bool is_tetrahedron( typename boost::graph_traits<FaceGraph>::halfedge_descripto
 template <typename FaceGraph>
 bool is_hexahedron( typename boost::graph_traits<FaceGraph>::halfedge_descriptor hd, const FaceGraph& g)   
 {
-  typedef boost::graph_traits<FaceGraph>::halfedge_descriptor halfedge_descriptor;
+  typedef typename boost::graph_traits<FaceGraph>::halfedge_descriptor halfedge_descriptor;
 
   halfedge_descriptor h1 = hd;
   if(is_border(h1,g)) return false;