diff --git a/TDS_2/include/CGAL/Triangulation_ds_iterators_2.h b/TDS_2/include/CGAL/Triangulation_ds_iterators_2.h
index 935a13b1b27..0cc3307ec6d 100644
--- a/TDS_2/include/CGAL/Triangulation_ds_iterators_2.h
+++ b/TDS_2/include/CGAL/Triangulation_ds_iterators_2.h
@@ -23,7 +23,7 @@
 
 #include <iterator>
 #include <CGAL/triangulation_assertions.h>
-//#include <CGAL/Triangulation_iterator_adaptator.h>
+#include <CGAL/tags.h>
 
 namespace CGAL {