diff --git a/Kernel_d/include/CGAL/Kernel_d/function_objects.h b/Kernel_d/include/CGAL/Kernel_d/function_objects.h
index 591f4bd313c..4c1bd3b7829 100644
--- a/Kernel_d/include/CGAL/Kernel_d/function_objects.h
+++ b/Kernel_d/include/CGAL/Kernel_d/function_objects.h
@@ -222,7 +222,7 @@ public:
   template <class T1, class T2>
   typename result<Intersect(T1,T2)>::type
   operator()(const T1& t1, const T2& t2) const
-  { return internal::intersection(t1, t2, R()); }
+  { return Intersections::internal::intersection(t1, t2, R()); }
 #endif
 };
 
@@ -235,7 +235,7 @@ class Do_intersect
     template <class T1, class T2>
     bool
     operator()(const T1& t1, const T2& t2) const
-    { return CGAL::internal::do_intersect(t1, t2, R()); }
+  { return CGAL::Intersections::internal::do_intersect(t1, t2, R()); }
 };
 
 } // end namespace internal
diff --git a/Kernel_d/include/CGAL/intersections_d.h b/Kernel_d/include/CGAL/intersections_d.h
index 6ad4e019ba2..b37feb2356c 100644
--- a/Kernel_d/include/CGAL/intersections_d.h
+++ b/Kernel_d/include/CGAL/intersections_d.h
@@ -30,6 +30,7 @@
 #include <CGAL/Intersection_traits.h>
 
 namespace CGAL {
+namespace Intersections {
 namespace internal {
 
 template <class R>
@@ -358,6 +359,7 @@ inline bool do_intersect(const typename R::Hyperplane_d& h, const typename R::Se
 { return do_intersect(s,h,r); }
 
 } //namespace internal
+} // namespace Intersections
 
 template<typename T>
 class Hyperplane_d;