diff --git a/NewKernel_d/include/CGAL/NewKernel_d/Vector/array.h b/NewKernel_d/include/CGAL/NewKernel_d/Vector/array.h
index a7b58a8f8a8..0ad9bb36d72 100644
--- a/NewKernel_d/include/CGAL/NewKernel_d/Vector/array.h
+++ b/NewKernel_d/include/CGAL/NewKernel_d/Vector/array.h
@@ -91,7 +91,7 @@ template<class NT_,class Dim_,class Max_dim_=Dim_> struct Array_vector {
 
 		struct Iterator_and_last {
 			template<typename Iter,typename T>
-				Vector operator()(unsigned d,Iter const& f,Iter const& e,CGAL_FORWARDABLE(T) t) const {
+                        Vector operator()(unsigned  CGAL_assertion_code(d),Iter const& f,Iter const& e,CGAL_FORWARDABLE(T) t) const {
 					CGAL_assertion(d==std::distance(f,e)+1);
 					CGAL_assertion(d<=d_);
 					//TODO: optimize for forward iterators