diff --git a/Kinetic_data_structures/include/CGAL/Polynomial/internal/Kernel/Sign_at.h b/Kinetic_data_structures/include/CGAL/Polynomial/internal/Kernel/Sign_at.h
index 2df3774ccbb..ff0d59ea8ee 100644
--- a/Kinetic_data_structures/include/CGAL/Polynomial/internal/Kernel/Sign_at.h
+++ b/Kinetic_data_structures/include/CGAL/Polynomial/internal/Kernel/Sign_at.h
@@ -35,7 +35,7 @@ class Sign_at
 public:
   Sign_at(K k=K()): k_(k) {
   }
-  Sign_at(){}
+
   typedef typename K::Root argument_type;
   typedef CGAL::Sign result_type;