diff --git a/Apollonius_graph_2/include/CGAL/Parabola_segment_2.h b/Apollonius_graph_2/include/CGAL/Parabola_segment_2.h
index 7c03ff5d5e5..20883169ba7 100644
--- a/Apollonius_graph_2/include/CGAL/Parabola_segment_2.h
+++ b/Apollonius_graph_2/include/CGAL/Parabola_segment_2.h
@@ -27,7 +27,7 @@ namespace Qt {
 }
 
 template < class Gt >
-class Parabola_segment_2 : public Parabola_2< Gt >
+struct Parabola_segment_2 : public Parabola_2< Gt >
 {
   typedef CGAL::Parabola_2<Gt>            Base;
   typedef typename Base::Site_2           Site_2;
@@ -39,10 +39,10 @@ class Parabola_segment_2 : public Parabola_2< Gt >
   using Base::t;
   using Base::f;
 
-protected:
+
   Point_2 p1, p2;
 
-public:
+
   Parabola_segment_2() : Parabola_2< Gt >() {}
 
   template<class ApolloniusSite>