diff --git a/NewKernel_d/include/CGAL/NewKernel_d/LA_eigen/constructors.h b/NewKernel_d/include/CGAL/NewKernel_d/LA_eigen/constructors.h
index 1bb4b2a33ef..1341a28f7df 100644
--- a/NewKernel_d/include/CGAL/NewKernel_d/LA_eigen/constructors.h
+++ b/NewKernel_d/include/CGAL/NewKernel_d/LA_eigen/constructors.h
@@ -92,7 +92,7 @@ namespace CGAL {
 
     struct Initializer_list {
       result_type operator()(std::initializer_list<NT> l) const {
-        return Iterator()(l.size(),l.begin(),l.end());
+        return Iterator()(static_cast<int>(l.size()),l.begin(),l.end());
       }
     };
 
diff --git a/Periodic_3_mesh_3/include/CGAL/Periodic_3_mesh_3/Protect_edges_sizing_field.h b/Periodic_3_mesh_3/include/CGAL/Periodic_3_mesh_3/Protect_edges_sizing_field.h
index 842abf61081..fd268aa6ed8 100644
--- a/Periodic_3_mesh_3/include/CGAL/Periodic_3_mesh_3/Protect_edges_sizing_field.h
+++ b/Periodic_3_mesh_3/include/CGAL/Periodic_3_mesh_3/Protect_edges_sizing_field.h
@@ -2113,8 +2113,10 @@ insert_balls(const Vertex_handle& vp,
                                                 curve_index, d_sign)
                 << ")\n";
 #endif
+      const FT sgn = (d_sign == CGAL::POSITIVE) ? 1.
+                   : (d_sign == CGAL::NEGATIVE ? -1. : 0.);
       const Bare_point new_point =
-        domain_.construct_point_on_curve(vpp, curve_index, d_sign * d / 2);
+        domain_.construct_point_on_curve(vpp, curve_index, sgn * d / 2);
       const int dim = 1; // new_point is on edge
       const Index index = domain_.index_from_curve_index(curve_index);
       const FT point_weight = CGAL::square(size_(new_point, dim, index));
diff --git a/Point_set_processing_3/include/CGAL/pointmatcher/compute_registration_transformation.h b/Point_set_processing_3/include/CGAL/pointmatcher/compute_registration_transformation.h
index d561b3b26a4..f58dbedb618 100644
--- a/Point_set_processing_3/include/CGAL/pointmatcher/compute_registration_transformation.h
+++ b/Point_set_processing_3/include/CGAL/pointmatcher/compute_registration_transformation.h
@@ -78,7 +78,7 @@ construct_icp(const NamedParameters1& np1, const NamedParameters2& np2)
 
   icp.setDefault();
 
-  const ICP_config null_config { "_null_pm_config_in_cgal" };
+  const ICP_config null_config { /*.name=*/"_null_pm_config_in_cgal", /*.params=*/{ } };
   const std::vector<ICP_config> null_config_chain { null_config };
   auto is_null_config = [&](const ICP_config& c) { return !c.name.compare(null_config.name); };
 
diff --git a/Polyhedron/demo/Polyhedron/include/CGAL/Polyhedron_kernel.h b/Polyhedron/demo/Polyhedron/include/CGAL/Polyhedron_kernel.h
index 0028d9f10d3..1652e42e9b6 100644
--- a/Polyhedron/demo/Polyhedron/include/CGAL/Polyhedron_kernel.h
+++ b/Polyhedron/demo/Polyhedron/include/CGAL/Polyhedron_kernel.h
@@ -94,7 +94,7 @@ public:
                         lp.set_a(index_x4, j, -1.0); // -x4
 
                         // right hand side (>= -dj)
-                        FT dj = distance_to_origin(plane) * CGAL::sign(plane.d());
+                        FT dj = distance_to_origin(plane) * static_cast<int>(CGAL::sign(plane.d()));
                         lp.set_b(j, -dj);
                 }