diff --git a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Curve_pair_analysis_2.h b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Curve_pair_analysis_2.h
index 8c338f83e35..97b0c3f63d0 100644
--- a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Curve_pair_analysis_2.h
+++ b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Curve_pair_analysis_2.h
@@ -446,11 +446,12 @@ public:
     };
 
     //! \brief Copy constructor
+#ifdef DOXYGEN_RUNNING 
     Curve_pair_analysis_2(const Self& alg_curve_pair)
         : Base(static_cast<const Base&>(alg_curve_pair)) 
     {
     }
-
+#endif
     // Assignable
     
     /*!