diff --git a/Straight_skeleton_2/examples/Straight_skeleton_2/exterior_offset_of_multiple_polygons_with_holes.cpp b/Straight_skeleton_2/examples/Straight_skeleton_2/exterior_offset_of_multiple_polygons_with_holes.cpp
index 92591eaa785..a3655becfe6 100644
--- a/Straight_skeleton_2/examples/Straight_skeleton_2/exterior_offset_of_multiple_polygons_with_holes.cpp
+++ b/Straight_skeleton_2/examples/Straight_skeleton_2/exterior_offset_of_multiple_polygons_with_holes.cpp
@@ -36,7 +36,7 @@ exterior_offset_of_disjoint_polygons_with_holes(double lOffset, const std::vecto
 
   if ( margin )
   {
-    double lm = CGAL::to_double(*margin);
+    double lm = *margin;
     CGAL::Bbox_2 bbox = bbox_2(outer_vertices.begin(), outer_vertices.end());
 
     double fxmin = bbox.xmin() - lm ;
@@ -110,6 +110,7 @@ int main()
   double lOffset = 1.1 ;
 
   PolygonWithHolesPtrVector offset_poly_with_holes = exterior_offset_of_disjoint_polygons_with_holes(lOffset,pwhs);
+  std::cout << offset_poly_with_holes.size() << " offset polygons" << std::endl;
 
   for (PolygonWithHolesPtr ptr : offset_poly_with_holes)
     CGAL::draw(*ptr);
diff --git a/Straight_skeleton_2/include/CGAL/Straight_skeleton_builder_traits_2.h b/Straight_skeleton_2/include/CGAL/Straight_skeleton_builder_traits_2.h
index 67c3ee429d9..2be2422c817 100644
--- a/Straight_skeleton_2/include/CGAL/Straight_skeleton_builder_traits_2.h
+++ b/Straight_skeleton_2/include/CGAL/Straight_skeleton_builder_traits_2.h
@@ -927,8 +927,8 @@ public:
   }
 
 public:
-  // TODO: as soon as an exact value we could refine the interval one. Not sure if it is worth it
-  Exact mExact_traits ;
+  // @todo as soon as an exact value we could refine the interval one. Not sure if it is worth it
+  Straight_skeleton_builder_traits_2_impl<Tag_false, EK> mExact_traits ;
 
   // Below is only used for the cached variables not the functor types
   Straight_skeleton_builder_traits_2_impl<Tag_false, FK> mApproximate_traits ;
diff --git a/Straight_skeleton_2/include/CGAL/create_straight_skeleton_2.h b/Straight_skeleton_2/include/CGAL/create_straight_skeleton_2.h
index ab985800ffa..dffeffc1b18 100644
--- a/Straight_skeleton_2/include/CGAL/create_straight_skeleton_2.h
+++ b/Straight_skeleton_2/include/CGAL/create_straight_skeleton_2.h
@@ -15,11 +15,13 @@
 #include <CGAL/license/Straight_skeleton_2.h>
 
 #include <CGAL/compute_outer_frame_margin.h>
+#include <CGAL/Straight_skeleton_2.h>
 #include <CGAL/Straight_skeleton_builder_2.h>
 #include <CGAL/Straight_skeleton_2/Polygon_iterators.h>
 
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 #include <CGAL/Kernel_traits.h>
+#include <CGAL/Polygon_2.h>
 
 #include <boost/optional/optional.hpp>
 #include <boost/shared_ptr.hpp>