diff --git a/Poisson_surface_reconstruction_3/include/CGAL/Mesh_3/Poisson_refine_cells_3.h b/Poisson_surface_reconstruction_3/include/CGAL/Mesh_3/Poisson_refine_cells_3.h
index 6b5305564ed..936563a780e 100644
--- a/Poisson_surface_reconstruction_3/include/CGAL/Mesh_3/Poisson_refine_cells_3.h
+++ b/Poisson_surface_reconstruction_3/include/CGAL/Mesh_3/Poisson_refine_cells_3.h
@@ -281,7 +281,7 @@ template <typename Tr,
  >
 class Poisson_refine_tets : 
   public BaseP, 
-  public Mesher_level <
+  public CGAL::Mesher_level <   // qualified with CGAL:: as CGAL::Mesh_3::Mesher_level also exists
     Tr,
     Poisson_refine_tets<Tr, Criteria, Surface, Oracle, BaseP, Facets_level>,
     typename Tr::Cell_handle,
@@ -294,7 +294,7 @@ class Poisson_refine_tets :
   Facets_level& facets_level;
 public:
   typedef Poisson_refine_tets<Tr, Criteria, Surface, Oracle, Base, Facets_level> Self;
-  typedef Mesher_level <
+  typedef CGAL::Mesher_level <
     Tr,
     Poisson_refine_tets<Tr, Criteria, Surface, Oracle, Base, Facets_level>,
     typename Tr::Cell_handle,