diff --git a/BGL/include/CGAL/boost/graph/Dual.h b/BGL/include/CGAL/boost/graph/Dual.h
index ff6ae143cfa..f71c7d543a1 100644
--- a/BGL/include/CGAL/boost/graph/Dual.h
+++ b/BGL/include/CGAL/boost/graph/Dual.h
@@ -22,6 +22,7 @@
 
 #include <CGAL/boost/graph/properties.h>
 #include <boost/range/distance.hpp>
+#include <CGAL/boost/graph/iterator.h>
 
 namespace CGAL {
 
diff --git a/BGL/include/CGAL/boost/graph/split_graph_into_polylines.h b/BGL/include/CGAL/boost/graph/split_graph_into_polylines.h
index dc833362822..32a4e702f8d 100644
--- a/BGL/include/CGAL/boost/graph/split_graph_into_polylines.h
+++ b/BGL/include/CGAL/boost/graph/split_graph_into_polylines.h
@@ -25,7 +25,7 @@
 #include <boost/foreach.hpp>
 #include <boost/graph/adjacency_list.hpp>
 #include <iostream>
-
+#include <CGAL/assertions.h>
 
 namespace CGAL {