diff --git a/Circular_kernel_3/include/CGAL/Circular_kernel_3/internal_function_compare_to_right_spherical_kernel.h b/Circular_kernel_3/include/CGAL/Circular_kernel_3/internal_function_compare_to_right_spherical_kernel.h
index c658257eb75..adb1eb2146b 100644
--- a/Circular_kernel_3/include/CGAL/Circular_kernel_3/internal_function_compare_to_right_spherical_kernel.h
+++ b/Circular_kernel_3/include/CGAL/Circular_kernel_3/internal_function_compare_to_right_spherical_kernel.h
@@ -70,7 +70,7 @@ struct Trait_for_cmp_tgt_theta_0{
   typename SK::FT 
   unsigned_tkz_coeff_normal( const typename SK::Point_3& C,const typename SK::FT& gamma_k) const
   {
-    return - CGAL_NTS sign(gamma_k)*C.y();
+    return - (int)CGAL_NTS sign(gamma_k)*C.y();
   }
 
   Tk_type