diff --git a/Skin_surface_3/test/Skin_surface_3/anchor_test.C b/Skin_surface_3/test/Skin_surface_3/anchor_test.C
index da3aac03d27..15f1176228f 100644
--- a/Skin_surface_3/test/Skin_surface_3/anchor_test.C
+++ b/Skin_surface_3/test/Skin_surface_3/anchor_test.C
@@ -3,6 +3,7 @@
 // *********************
 // Regular triangulation
 // *********************
+#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 #include <CGAL/Regular_triangulation_euclidean_traits_3.h>
 #include <CGAL/Regular_triangulation_3.h>
 typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
diff --git a/Skin_surface_3/test/Skin_surface_3/degenerate_test.C b/Skin_surface_3/test/Skin_surface_3/degenerate_test.C
index 43c13b27952..ad71256dcc5 100644
--- a/Skin_surface_3/test/Skin_surface_3/degenerate_test.C
+++ b/Skin_surface_3/test/Skin_surface_3/degenerate_test.C
@@ -9,7 +9,7 @@
 #include <algorithm>
 
 typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
-typedef CGAL::Regular_triangulation_euclidean_traits_3<K>   Traits;
+typedef CGAL::Mixed_complex_traits_3<K>                     Traits;
 typedef CGAL::Skin_surface_3<Traits>                        Skin_surface_3;
 typedef Skin_surface_3::RT                                  RT;
 typedef Skin_surface_3::Weighted_point                      Weighted_point;
diff --git a/Skin_surface_3/test/Skin_surface_3/subdivision_test.C b/Skin_surface_3/test/Skin_surface_3/subdivision_test.C
index ae4b5c0cb3e..e18b0d3b845 100644
--- a/Skin_surface_3/test/Skin_surface_3/subdivision_test.C
+++ b/Skin_surface_3/test/Skin_surface_3/subdivision_test.C
@@ -9,7 +9,7 @@
 #include <fstream>
 
 typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
-typedef CGAL::Regular_triangulation_euclidean_traits_3<K>   Traits;
+typedef CGAL::Mixed_complex_traits_3<K>                     Traits;
 typedef CGAL::Skin_surface_3<Traits>                        Skin_surface_3;
 typedef Skin_surface_3::RT                                  RT;
 typedef Skin_surface_3::Weighted_point                      Weighted_point;