diff --git a/share/openPMD/thirdParty/pybind11/include/pybind11/detail/class.h b/share/openPMD/thirdParty/pybind11/include/pybind11/detail/class.h
index 4f85a7f4f0..cc1e40ce7a 100644
--- a/share/openPMD/thirdParty/pybind11/include/pybind11/detail/class.h
+++ b/share/openPMD/thirdParty/pybind11/include/pybind11/detail/class.h
@@ -317,8 +317,8 @@ inline void register_instance(instance *self, void *valptr, const type_info *tin
 
 inline bool deregister_instance(instance *self, void *valptr, const type_info *tinfo) {
     bool ret = deregister_instance_impl(valptr, self);
-    // if (!tinfo->simple_ancestors)
-    //     traverse_offset_bases(valptr, tinfo, self, deregister_instance_impl);
+    if (!tinfo->simple_ancestors)
+        traverse_offset_bases(valptr, tinfo, self, deregister_instance_impl);
     return ret;
 }