diff --git a/Surface_reconstruction_points_3/examples/Surface_reconstruction_points_3/poisson_reconstruction.cpp b/Surface_reconstruction_points_3/examples/Surface_reconstruction_points_3/poisson_reconstruction.cpp
index 3a8f58ab1a3..1699458881a 100644
--- a/Surface_reconstruction_points_3/examples/Surface_reconstruction_points_3/poisson_reconstruction.cpp
+++ b/Surface_reconstruction_points_3/examples/Surface_reconstruction_points_3/poisson_reconstruction.cpp
@@ -308,7 +308,10 @@ int main(int argc, char * argv[])
       if (solver_name == "eigen")
       {
         std::cerr << "Use Eigen 3\n";
-        if ( ! function.compute_implicit_function() )
+        CGAL::Eigen_solver_traits<Eigen::ConjugateGradient<CGAL::Eigen_sparse_symmetric_matrix<double>::EigenType> > solver;
+        if ( ! function.compute_implicit_function(solver, visitor, 
+                                                approximation_ratio,
+                                                average_spacing_ratio) )
         {
           std::cerr << "Error: cannot compute implicit function" << std::endl;
           return EXIT_FAILURE;
diff --git a/Surface_reconstruction_points_3/include/CGAL/Poisson_reconstruction_function.h b/Surface_reconstruction_points_3/include/CGAL/Poisson_reconstruction_function.h
index dee36343d52..c2087def672 100644
--- a/Surface_reconstruction_points_3/include/CGAL/Poisson_reconstruction_function.h
+++ b/Surface_reconstruction_points_3/include/CGAL/Poisson_reconstruction_function.h
@@ -413,7 +413,7 @@ public:
     
     // Prints status
     CGAL_TRACE_STREAM << "Delaunay refinement: " << "added ";
-    for(int i = 0; i < NB.size()-1; i++){
+    for(std::size_t i = 0; i < NB.size()-1; i++){
       CGAL_TRACE_STREAM << NB[i] << " + "; 
     } 
     CGAL_TRACE_STREAM << NB.back() << " Steiner points, "
@@ -523,7 +523,7 @@ public:
   {
     m_Bary->resize(m_tr->number_of_cells());
 
-    for(int i=0; i< m_Bary->size();i++){
+    for(std::size_t i=0; i< m_Bary->size();i++){
       (*m_Bary)[i][0]=-1;
     }
   }