diff --git a/Interpolation/include/CGAL/surface_neighbor_coordinates_3.h b/Interpolation/include/CGAL/surface_neighbor_coordinates_3.h
index 19b33128c6b..ce9322bc55c 100644
--- a/Interpolation/include/CGAL/surface_neighbor_coordinates_3.h
+++ b/Interpolation/include/CGAL/surface_neighbor_coordinates_3.h
@@ -94,7 +94,7 @@ surface_neighbor_coordinates_certified_3(
 			     const typename Kernel::Point_3& p,
 			     const typename Kernel::Vector_3& normal,
 			     const typename Kernel::FT& radius,
-			     OutputIterator out, const Kernel& K)
+			     OutputIterator out, const Kernel& )
 {
   typedef Voronoi_intersection_2_traits_3<Kernel> I_gt;
   return surface_neighbor_coordinates_certified_3
diff --git a/Interpolation/include/CGAL/surface_neighbors_3.h b/Interpolation/include/CGAL/surface_neighbors_3.h
index c64f16cd19e..8d6a5ffebff 100644
--- a/Interpolation/include/CGAL/surface_neighbors_3.h
+++ b/Interpolation/include/CGAL/surface_neighbors_3.h
@@ -38,7 +38,7 @@ OutputIterator
 surface_neighbors_3(InputIterator first, InputIterator beyond,
 		    const typename Kernel::Point_3& p,
 		    const typename Kernel::Vector_3& normal,
-		    OutputIterator out, const Kernel& K)
+		    OutputIterator out, const Kernel& )
 {
   typedef Voronoi_intersection_2_traits_3<Kernel> I_gt;
   return surface_neighbors_3(first, beyond, p, out, I_gt(p,normal));
@@ -94,7 +94,7 @@ surface_neighbors_certified_3(InputIterator first,
 			      InputIterator beyond,
 			      const typename Kernel::Point_3& p,
 			      const typename Kernel::Vector_3& normal,
-			      OutputIterator out, const Kernel& K)
+			      OutputIterator out, const Kernel& )
 {
   typedef Voronoi_intersection_2_traits_3<Kernel> I_gt;
   return surface_neighbors_certified_3(first, beyond, p, out, I_gt(p,normal));
diff --git a/Interpolation/test/Interpolation/include/CGAL/_test_interpolation_functions_2.C b/Interpolation/test/Interpolation/include/CGAL/_test_interpolation_functions_2.C
index dbfb22f007d..90cc1286f78 100644
--- a/Interpolation/test/Interpolation/include/CGAL/_test_interpolation_functions_2.C
+++ b/Interpolation/test/Interpolation/include/CGAL/_test_interpolation_functions_2.C
@@ -70,22 +70,24 @@ bool test_barycenter(ForwardIterator first, ForwardIterator beyond,
 template < class ForwardIterator, class Functor, class GradFunctor,
            class Gt>
 bool
-_test_sibson_c1_interpolation_sqrt(ForwardIterator first,
-				   ForwardIterator beyond,
+_test_sibson_c1_interpolation_sqrt(ForwardIterator ,
+				   ForwardIterator ,
 				   const typename
 				   std::iterator_traits<ForwardIterator>
 				   ::value_type::second_type&
-				   norm, const typename
+				   /* norm */, 
+                                   const typename
 				   std::iterator_traits<ForwardIterator>
-				   ::value_type::first_type& p,
-				   Functor f, GradFunctor grad_f,
+				   ::value_type::first_type& /* p */,
+				   Functor /* f */, 
+                                   GradFunctor /* grad_f */,
 				   const Gt& geom_traits,
 				   const typename
 				   std::iterator_traits<ForwardIterator>
-				   ::value_type::second_type& tolerance,
+				   ::value_type::second_type& /* tolerance */,
 				   const typename
 				   std::iterator_traits<ForwardIterator>
-				   ::value_type::second_type& exact_value,
+				   ::value_type::second_type& /* exact_value */,
                                    CGAL::Integral_domain_without_division_tag)
 {
   bool UNTESTED_STUFF_BECAUSE_SQRT_IS_NOT_SUPPORTED;