diff --git a/Algebraic_kernel_d/test/Algebraic_kernel_d/include/CGAL/_test_ak_polynomial_traits_d.h b/Algebraic_kernel_d/test/Algebraic_kernel_d/include/CGAL/_test_ak_polynomial_traits_d.h
index a854deb4142..941c5b7ebf1 100644
--- a/Algebraic_kernel_d/test/Algebraic_kernel_d/include/CGAL/_test_ak_polynomial_traits_d.h
+++ b/Algebraic_kernel_d/test/Algebraic_kernel_d/include/CGAL/_test_ak_polynomial_traits_d.h
@@ -33,7 +33,7 @@ struct test_ak_polynomial_traits_d<CGAL::Tag_true,PT>{
 
 template <class PT>
 struct test_ak_polynomial_traits_d<CGAL::Tag_false,PT>{
-        void operator()(const PT& traits){
+        void operator()(const PT& /* traits */){
                 std::cout<<
                         "\nATTENTION: not testing inexact polynomial traits"<<
                         std::endl;