diff --git a/Arrangement_on_surface_2/include/CGAL/graph_traits_Arrangement_2.h b/Arrangement_on_surface_2/include/CGAL/graph_traits_Arrangement_2.h
index 2eb24286f15..365723ce6b6 100644
--- a/Arrangement_on_surface_2/include/CGAL/graph_traits_Arrangement_2.h
+++ b/Arrangement_on_surface_2/include/CGAL/graph_traits_Arrangement_2.h
@@ -349,7 +349,7 @@ public:
   {}
 };
 
-}; // namespace boost
+} // namespace boost
 
 CGAL_BEGIN_NAMESPACE