diff --git a/Kernel_23/include/CGAL/Kernel_23/internal/Projection_traits_base_3.h b/Kernel_23/include/CGAL/Kernel_23/internal/Projection_traits_base_3.h
index c11b1f523f3..731499c6d8b 100644
--- a/Kernel_23/include/CGAL/Kernel_23/internal/Projection_traits_base_3.h
+++ b/Kernel_23/include/CGAL/Kernel_23/internal/Projection_traits_base_3.h
@@ -374,6 +374,7 @@ template <class Traits>
 class Compare_xy_along_axis
 {
   // private members
+  typedef typename Traits::Comparison_result Comparison_result;
   typedef typename Traits::Vector_3 Vector_3;
   typedef typename Traits::Point_2 Point;
   Vector_3 base1, base2;
@@ -385,8 +386,6 @@ public:
     CGAL_TIME_PROFILER("Construct Compare_xy_along_axis")
   }
 
-  typedef Comparison_result result_type;
-
   Comparison_result operator()(const Point& p, const Point& q) const
   {
     Compare_along_axis<Traits> cx(base1);