diff --git a/STL_Extension/include/CGAL/internal/boost/array_binary_tree.hpp b/STL_Extension/include/CGAL/internal/boost/array_binary_tree.hpp
index 6d45ed56617..3e1fa963176 100644
--- a/STL_Extension/include/CGAL/internal/boost/array_binary_tree.hpp
+++ b/STL_Extension/include/CGAL/internal/boost/array_binary_tree.hpp
@@ -20,9 +20,10 @@
 #ifndef CGAL_INTERNAL_ARRAY_BINARY_TREE_HPP
 #define CGAL_INTERNAL_ARRAY_BINARY_TREE_HPP
 
+#include <CGAL/iterator.h>
 #include <boost/config.hpp>
-#include <iterator>
 
+#include <iterator>
 #include <functional>
 
 namespace CGAL { namespace internal {