diff --git a/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Corefinement/Generic_clip_output_builder.h b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Corefinement/Generic_clip_output_builder.h
index f391696cb3a..0a7c1961ff1 100644
--- a/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Corefinement/Generic_clip_output_builder.h
+++ b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Corefinement/Generic_clip_output_builder.h
@@ -125,6 +125,7 @@ public:
 
   void set_vertex_id(vertex_descriptor v, Node_id node_id, const TriangleMesh& tm)
   {
+    CGAL_use(tm);
     CGAL_assertion(&tm == &tm1);
     vertex_to_node_id1.insert( std::make_pair(v, node_id) );
   }