diff --git a/Point_set_3/include/CGAL/Point_set_3/IO.h b/Point_set_3/include/CGAL/Point_set_3/IO.h
index 3c06d835af2..4b96e6a5c13 100644
--- a/Point_set_3/include/CGAL/Point_set_3/IO.h
+++ b/Point_set_3/include/CGAL/Point_set_3/IO.h
@@ -289,7 +289,8 @@ read_off_point_set(
 }
 
 
-#if (!defined(CGAL_CFG_NO_CPP0X_RVALUE_REFERENCE) && !defined(CGAL_CFG_NO_CPP0X_VARIADIC_TEMPLATES)) || defined(DOXYGEN_RUNNING)
+//#if (!defined(CGAL_CFG_NO_CPP0X_RVALUE_REFERENCE) && !defined(CGAL_CFG_NO_CPP0X_VARIADIC_TEMPLATES)) || defined(DOXYGEN_RUNNING)
+#if 0
 /*!
   \ingroup PkgPointSet3IO
  */
@@ -628,24 +629,28 @@ bool
 read_ply_point_set(std::istream&, CGAL::Point_set_3<Point, Vector>&)
 {
   CGAL_static_assertion_msg (false, "CGAL PLY reader requires a C++11 compiler");
+  return false;
 }
 template <typename Point, typename Vector>
 bool
 write_ply_point_set(std::ostream&, const CGAL::Point_set_3<Point, Vector>&)
 {
   CGAL_static_assertion_msg (false, "CGAL PLY writer requires a C++11 compiler");
+  return false;
 }
 template <typename Point, typename Vector>
 bool
 read_las_point_set(std::istream&, CGAL::Point_set_3<Point, Vector>&)
 {
   CGAL_static_assertion_msg (false, "CGAL LAS reader requires a C++11 compiler");
+  return false;
 }
 template <typename Point, typename Vector>
 bool
 write_las_point_set(std::ostream&, const CGAL::Point_set_3<Point, Vector>&)
 {
   CGAL_static_assertion_msg (false, "CGAL LAS writer requires a C++11 compiler");
+  return false;
 }
 #endif // CXX11