diff --git a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Curve_analysis_2.h b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Curve_analysis_2.h
index f77a1c6912b..73f96d078bc 100644
--- a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Curve_analysis_2.h
+++ b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Curve_analysis_2.h
@@ -505,11 +505,12 @@ public:
     }
 
     //! \brief Copy constructor
+#ifdef DOXYGEN_RUNNING
     Curve_analysis_2(const Self& alg_curve)
         : Base(static_cast<const Base&>(alg_curve)) 
     {
     }
-
+#endif
 
     //!@}