diff --git a/Nef_S2/include/CGAL/Nef_S2/Sphere_map.h b/Nef_S2/include/CGAL/Nef_S2/Sphere_map.h
index 9c77917352c..7be76534140 100644
--- a/Nef_S2/include/CGAL/Nef_S2/Sphere_map.h
+++ b/Nef_S2/include/CGAL/Nef_S2/Sphere_map.h
@@ -231,7 +231,7 @@ public:
   construction means cloning an isomorphic structure and is thus an
   expensive operation.}*/
 
-  Sphere_map(bool b=false) : boundary_item_(boost::none), 
+  Sphere_map(bool = false) : boundary_item_(boost::none), 
     svertices_(), sedges_(), sfaces_(), shalfloop_() {}
 
   ~Sphere_map() { clear(); }
@@ -368,7 +368,7 @@ public:
   }
 
   SVertex_alloc vertex_allocator;
-  SVertex* get_vertex_node( const SVertex& t) {
+  SVertex* get_vertex_node( const SVertex& ) {
     SVertex* p = vertex_allocator.allocate(1);
     vertex_allocator.construct( p, SVertex());
     return p;
@@ -379,7 +379,7 @@ public:
   }
 
   SHalfedge_alloc halfedge_allocator;
-  SHalfedge* get_halfedge_node( const SHalfedge& t) {
+  SHalfedge* get_halfedge_node( const SHalfedge& ) {
     SHalfedge* p = halfedge_allocator.allocate(1);
     halfedge_allocator.construct( p, SHalfedge());
     return p;
@@ -390,7 +390,7 @@ public:
   }
 
   SFace_alloc face_allocator;
-  SFace* get_face_node( const SFace& t) {
+  SFace* get_face_node( const SFace& ) {
     SFace* p = face_allocator.allocate(1);
     face_allocator.construct( p, SFace());
     return p;
diff --git a/Nef_S2/include/CGAL/Nef_polyhedron_S2.h b/Nef_S2/include/CGAL/Nef_polyhedron_S2.h
index 678728e19ff..1ba0e637f53 100644
--- a/Nef_S2/include/CGAL/Nef_polyhedron_S2.h
+++ b/Nef_S2/include/CGAL/Nef_polyhedron_S2.h
@@ -76,7 +76,7 @@ class Nef_polyhedron_S2_rep {
   
 public:
   Nef_polyhedron_S2_rep() : sm_() {}
-  Nef_polyhedron_S2_rep(const Self& R) : sm_() {}
+  Nef_polyhedron_S2_rep(const Self&) : sm_() {}
   ~Nef_polyhedron_S2_rep() { sm_.clear(); }
 };