diff --git a/Kinetic_space_partition/include/CGAL/KSP/utils.h b/Kinetic_space_partition/include/CGAL/KSP/utils.h
index d8e99ddddc2..64a2d997296 100644
--- a/Kinetic_space_partition/include/CGAL/KSP/utils.h
+++ b/Kinetic_space_partition/include/CGAL/KSP/utils.h
@@ -41,7 +41,6 @@
 #include <CGAL/linear_least_squares_fitting_2.h>
 #include <CGAL/linear_least_squares_fitting_3.h>
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
-#include <CGAL/Polygon_2_algorithms.h>
 
 // Boost includes.
 #include <boost/iterator/function_output_iterator.hpp>
diff --git a/Kinetic_space_partition/include/CGAL/KSP_3/Initializer.h b/Kinetic_space_partition/include/CGAL/KSP_3/Initializer.h
index be34da2cb05..74b29a5d461 100644
--- a/Kinetic_space_partition/include/CGAL/KSP_3/Initializer.h
+++ b/Kinetic_space_partition/include/CGAL/KSP_3/Initializer.h
@@ -17,14 +17,14 @@
 
 // CGAL includes.
 #include <CGAL/Timer.h>
-#include <CGAL/optimal_bounding_box.h>
-#include <CGAL/Boolean_set_operations_2.h>
+//#include <CGAL/optimal_bounding_box.h>
+//#include <CGAL/Boolean_set_operations_2.h>
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 #include <CGAL/Exact_predicates_exact_constructions_kernel.h>
 #include <CGAL/intersections.h>
 #include <CGAL/min_quadrilateral_2.h>
-#include <CGAL/Aff_transformation_2.h>
-#include <boost/optional/optional_io.hpp>
+//#include <CGAL/Aff_transformation_2.h>
+//#include <boost/optional/optional_io.hpp>
 
 // Internal includes.
 #include <CGAL/KSP/utils.h>
@@ -74,7 +74,7 @@ private:
   using From_exact = CGAL::Cartesian_converter<Intersection_kernel, Kernel>;
 
   using Bbox_3 = CGAL::Bbox_3;
-  using OBB_traits = CGAL::Oriented_bounding_box_traits_3<Kernel>;
+  //using OBB_traits = CGAL::Oriented_bounding_box_traits_3<Kernel>;
 
   using Parameters = KSP::internal::Parameters_3<FT>;