diff --git a/Polygon_mesh_processing/examples/Polygon_mesh_processing/hole_filling_example_OM.cpp b/Polygon_mesh_processing/examples/Polygon_mesh_processing/hole_filling_example_OM.cpp
index 55af0ad7bc5..73a2294f43f 100644
--- a/Polygon_mesh_processing/examples/Polygon_mesh_processing/hole_filling_example_OM.cpp
+++ b/Polygon_mesh_processing/examples/Polygon_mesh_processing/hole_filling_example_OM.cpp
@@ -52,7 +52,7 @@ int main(int argc, char* argv[])
     }
   }
 
-  assert(CGAL::is_valid_polygon_mesh(mesh));
+  CGAL_assertion(CGAL::is_valid_polygon_mesh(mesh));
   std::cout << std::endl;
   std::cout << nb_holes << " holes have been filled" << std::endl;