diff --git a/Convex_hull_3/include/CGAL/Indexed_triangle_set.h b/Convex_hull_3/include/CGAL/Indexed_triangle_set.h
index 9d76cdf68d1..622cfedc4a6 100644
--- a/Convex_hull_3/include/CGAL/Indexed_triangle_set.h
+++ b/Convex_hull_3/include/CGAL/Indexed_triangle_set.h
@@ -31,7 +31,7 @@ struct Indexed_triangle_set
   std::vector<std::array<int,3> >& faces;
 
   Indexed_triangle_set(std::vector<P>& vertices,
-		       std::vector<std::array<int,3> >& faces)
+                       std::vector<std::array<int,3> >& faces)
     : vertices(vertices), faces(faces)
   {}
 };
diff --git a/Convex_hull_3/include/CGAL/convex_hull_3.h b/Convex_hull_3/include/CGAL/convex_hull_3.h
index 4076e75a815..87257ec59a3 100644
--- a/Convex_hull_3/include/CGAL/convex_hull_3.h
+++ b/Convex_hull_3/include/CGAL/convex_hull_3.h
@@ -1088,7 +1088,7 @@ void convex_hull_3(const VertexListGraph& g,
 template <class InputIterator, class P>
 void convex_hull_3(InputIterator first, InputIterator beyond,
                    std::vector<P>& vertices,
-		           std::vector<std::array<int,3> >& faces,
+                           std::vector<std::array<int,3> >& faces,
                    typename std::enable_if<CGAL::is_iterator<InputIterator>::value>::type* = 0)
 {
   typedef typename std::iterator_traits<InputIterator>::value_type Point_3;