diff --git a/Circular_kernel_3/include/CGAL/Circular_kernel_3/Circular_arc_point_3.h b/Circular_kernel_3/include/CGAL/Circular_kernel_3/Circular_arc_point_3.h
index bfb44edf9245..35dc8b46908c 100644
--- a/Circular_kernel_3/include/CGAL/Circular_kernel_3/Circular_arc_point_3.h
+++ b/Circular_kernel_3/include/CGAL/Circular_kernel_3/Circular_arc_point_3.h
@@ -211,7 +211,7 @@ class Circular_arc_point_3
 
   const Root_for_spheres_2_3 & coordinates() const { return get_pointee_or_identity(base); }
 
-  const CGAL::Bbox_3 bbox() const {
+  CGAL::Bbox_3 bbox() const {
     return get_pointee_or_identity(base).bbox();
   }
 
diff --git a/Circular_kernel_3/include/CGAL/Circular_kernel_3/Line_arc_3.h b/Circular_kernel_3/include/CGAL/Circular_kernel_3/Line_arc_3.h
index 9d10940f0aaf..d726f22b1fd7 100644
--- a/Circular_kernel_3/include/CGAL/Circular_kernel_3/Line_arc_3.h
+++ b/Circular_kernel_3/include/CGAL/Circular_kernel_3/Line_arc_3.h
@@ -168,7 +168,7 @@ namespace CGAL {
         return begin_less_xyz_than_end() ? target() : source();
       }
 
-      const CGAL::Bbox_3 bbox() const {
+      CGAL::Bbox_3 bbox() const {
         return source().bbox() + target().bbox();
       }