diff --git a/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/refine_mesh_at_isolevel.h b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/refine_mesh_at_isolevel.h
index 7a3b2c0765e..4e9082996e4 100644
--- a/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/refine_mesh_at_isolevel.h
+++ b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/refine_mesh_at_isolevel.h
@@ -15,6 +15,7 @@
 
 #include <CGAL/license/Polygon_mesh_processing/miscellaneous.h>
 
+#include <CGAL/boost/graph/Euler_operations.h>
 #include <CGAL/boost/graph/named_params_helper.h>
 
 namespace CGAL {