diff --git a/Shape_detection/include/CGAL/Shape_detection/Efficient_RANSAC/Efficient_RANSAC.h b/Shape_detection/include/CGAL/Shape_detection/Efficient_RANSAC/Efficient_RANSAC.h
index 59a0f0be6df..ff54549274a 100644
--- a/Shape_detection/include/CGAL/Shape_detection/Efficient_RANSAC/Efficient_RANSAC.h
+++ b/Shape_detection/include/CGAL/Shape_detection/Efficient_RANSAC/Efficient_RANSAC.h
@@ -44,7 +44,7 @@
 namespace CGAL {
 
 // Forward declaration for normal check
-template<typename Point_3, typename Vector_3>
+template<typename Point_3, typename Vector_3 = typename Kernel_traits<Point_3>::Kernel::Vector_3>
 class Point_set_3;
 
 namespace Shape_detection {
diff --git a/Shape_detection/include/CGAL/Shape_detection/Region_growing/Point_set/Least_squares_cylinder_fit_sorting.h b/Shape_detection/include/CGAL/Shape_detection/Region_growing/Point_set/Least_squares_cylinder_fit_sorting.h
index 0184e3a620d..6f9cb8b0668 100644
--- a/Shape_detection/include/CGAL/Shape_detection/Region_growing/Point_set/Least_squares_cylinder_fit_sorting.h
+++ b/Shape_detection/include/CGAL/Shape_detection/Region_growing/Point_set/Least_squares_cylinder_fit_sorting.h
@@ -23,7 +23,7 @@
 namespace CGAL {
 
 // Forward declaration for normal check
-template<typename Point_3, typename Vector_3>
+template<typename Point_3, typename Vector_3 = typename Kernel_traits<Point_3>::Kernel::Vector_3>
 class Point_set_3;
 
 namespace Shape_detection {
diff --git a/Shape_detection/include/CGAL/Shape_detection/Region_growing/Point_set/Least_squares_plane_fit_sorting.h b/Shape_detection/include/CGAL/Shape_detection/Region_growing/Point_set/Least_squares_plane_fit_sorting.h
index a9977aaf4f1..c225ea5f47a 100644
--- a/Shape_detection/include/CGAL/Shape_detection/Region_growing/Point_set/Least_squares_plane_fit_sorting.h
+++ b/Shape_detection/include/CGAL/Shape_detection/Region_growing/Point_set/Least_squares_plane_fit_sorting.h
@@ -23,7 +23,7 @@
 namespace CGAL {
 
 // Forward declaration for normal check
-template<typename Point_3, typename Vector_3>
+template<typename Point_3, typename Vector_3 = typename Kernel_traits<Point_3>::Kernel::Vector_3>
 class Point_set_3;
 
 namespace Shape_detection {