diff --git a/Mesh_3/include/CGAL/IO/File_tetgen.h b/Mesh_3/include/CGAL/IO/File_tetgen.h
index 20abcf0e355..a80affd8ca6 100644
--- a/Mesh_3/include/CGAL/IO/File_tetgen.h
+++ b/Mesh_3/include/CGAL/IO/File_tetgen.h
@@ -92,7 +92,7 @@ output_to_tetgen(std::string filename,
 
   const Tr& tr = c3t3.triangulation();
 
-  std::map<Vertex_handle, int> V;
+  std::map<Vertex_handle, std::size_t> V;
 
   //-------------------------------------------------------
   // File output
diff --git a/Triangulation_2/include/CGAL/Regular_triangulation_2.h b/Triangulation_2/include/CGAL/Regular_triangulation_2.h
index 60075323627..a002e01f8e0 100644
--- a/Triangulation_2/include/CGAL/Regular_triangulation_2.h
+++ b/Triangulation_2/include/CGAL/Regular_triangulation_2.h
@@ -400,7 +400,7 @@ private:
   template <class Tuple_or_pair,class InputIterator>
   std::ptrdiff_t insert_with_info(InputIterator first,InputIterator last)
   {
-    int n = number_of_vertices();
+    size_type n = number_of_vertices();
     std::vector<std::ptrdiff_t> indices;
     std::vector<Weighted_point> points;
     std::vector<typename Triangulation_data_structure::Vertex::Info> infos;