diff --git a/Kernel_23/doc/Kernel_23/Concepts/FunctionObjectConcepts.h b/Kernel_23/doc/Kernel_23/Concepts/FunctionObjectConcepts.h
index 7057cf95ccda..5017dc6c12fd 100644
--- a/Kernel_23/doc/Kernel_23/Concepts/FunctionObjectConcepts.h
+++ b/Kernel_23/doc/Kernel_23/Concepts/FunctionObjectConcepts.h
@@ -3896,7 +3896,7 @@ class ConstructBbox_3 {
   /*!
     returns a bounding box of `i`.
   */
-  CGAL::Bbox_3 operator()(const Kernel::Iso_Cuboid_3
+  CGAL::Bbox_3 operator()(const Kernel::Iso_cuboid_3
                           &i);
 
   /*!