diff --git a/Boolean_set_operations_2/include/CGAL/Boolean_set_operations_2/Gps_default_dcel.h b/Boolean_set_operations_2/include/CGAL/Boolean_set_operations_2/Gps_default_dcel.h
index 30f429a6f23..77d7bc3a98e 100644
--- a/Boolean_set_operations_2/include/CGAL/Boolean_set_operations_2/Gps_default_dcel.h
+++ b/Boolean_set_operations_2/include/CGAL/Boolean_set_operations_2/Gps_default_dcel.h
@@ -107,13 +107,13 @@ public:
       m_info &= ~VISITED;
   }
 
-  typename Arr_face_base::Outer_ccbs_container&
+  Arr_face_base::Outer_ccbs_container&
   _outer_ccbs()
   {
     return this->outer_ccbs;
   }
 
-  typename Arr_face_base::Inner_ccbs_container&
+  Arr_face_base::Inner_ccbs_container&
   _inner_ccbs()
   {
     return this->inner_ccbs;