diff --git a/Combinatorial_map/include/CGAL/Face_graph_wrapper.h b/Combinatorial_map/include/CGAL/Face_graph_wrapper.h
index ba3475a6aa0..b16371eb803 100644
--- a/Combinatorial_map/include/CGAL/Face_graph_wrapper.h
+++ b/Combinatorial_map/include/CGAL/Face_graph_wrapper.h
@@ -23,6 +23,7 @@
 
 #include <CGAL/Functors_for_face_graph_wrapper.h>
 #include <CGAL/Iterators_for_face_graph_wrapper.h>
+#include <CGAL/internal/Combinatorial_map_internal_functors.h>
 
 namespace CGAL
 {