diff --git a/Kernel_23/include/CGAL/Kernel/concept_archetype_functors.h b/Kernel_23/include/CGAL/Kernel/concept_archetype_functors.h
index 0343bbc51ca..c6c5d7b030a 100644
--- a/Kernel_23/include/CGAL/Kernel/concept_archetype_functors.h
+++ b/Kernel_23/include/CGAL/Kernel/concept_archetype_functors.h
@@ -1405,6 +1405,20 @@ public:
     { return Point_3(); }
 };
 
+template <typename K>
+class Construct_normal_3
+{
+    typedef typename K::Point_3   Point_3;
+    typedef typename K::Vector_3   Vector_3;
+public:
+    typedef Vector_3          result_type;
+    typedef Arity_tag< 2 >   Arity;
+
+    Vector_3
+    operator()(const Point_3&, const Point_3&, const Point_3&) const
+    { return Vector_3(); }
+};
+
 template <typename K>
 class Construct_object_2
 {
@@ -2163,6 +2177,20 @@ public:
     { return Triangle_3(); }
 };
 
+template <typename K>
+class Construct_unit_normal_3
+{
+    typedef typename K::Point_3   Point_3;
+    typedef typename K::Vector_3   Vector_3;
+public:
+    typedef Vector_3          result_type;
+    typedef Arity_tag< 2 >   Arity;
+
+    Vector_3
+    operator()(const Point_3&, const Point_3&, const Point_3&) const
+    { return Vector_3(); }
+};
+
 template <typename K>
 class Construct_vector_2
 {