diff --git a/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_triangle_3.h b/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_triangle_3.h
index 0b85fc87108..fbb1a21ef7a 100644
--- a/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_triangle_3.h
+++ b/Kernel_23/test/Kernel_23/include/CGAL/_test_cls_triangle_3.h
@@ -36,9 +36,6 @@ _test_cls_triangle_3(const R& )
  typedef typename  R::RT    RT;
  typedef typename  R::FT    FT;
 
- typename R::Triangle_3 it;
- CGAL::Triangle_3<R> t0(it);
-
  RT n0 =  0;
  RT n1 = 12;
  RT n2 = 16;
@@ -61,7 +58,10 @@ _test_cls_triangle_3(const R& )
  CGAL::Point_3<R> ps2( n0, n7, n0, n5); // (0, 3, 0)
  CGAL::Point_3<R> ps1( n7, n0, n0, n5); // (3, 0, 0)
 
+ typename R::Triangle_3 it; // test default-constructor
+
  const CGAL::Triangle_3<R> t1(p1,p2,p3);
+ CGAL::Triangle_3<R> t0(t1);
  CGAL::Triangle_3<R> t2(p4,p2,p3);
  CGAL::Triangle_3<R> t3(ps1,ps2,ps3);
  CGAL::Triangle_3<R> t4(ps2,ps1,ps3);
diff --git a/Kernel_23/test/Kernel_23/include/CGAL/_test_new_3.h b/Kernel_23/test/Kernel_23/include/CGAL/_test_new_3.h
index 6b5939a9afa..c96987f970f 100644
--- a/Kernel_23/test/Kernel_23/include/CGAL/_test_new_3.h
+++ b/Kernel_23/test/Kernel_23/include/CGAL/_test_new_3.h
@@ -221,8 +221,8 @@ test_new_3(const R& rep)
 
   typename R::Construct_tetrahedron_3 construct_tetrahedron
         = rep.construct_tetrahedron_3_object();
-  Tetrahedron_3 th1;
-  Tetrahedron_3 th2 = construct_tetrahedron(p2,p3,p4,p5);
+  Tetrahedron_3 th0; // test default-constructor
+  Tetrahedron_3 th2 = construct_tetrahedron(p2,p3,p4,p5), th1 = th2;
 
   typename R::Construct_iso_cuboid_3 construct_iso_cuboid
         = rep.construct_iso_cuboid_3_object();