diff --git a/src/ifcparse/IfcHierarchyHelper.h b/src/ifcparse/IfcHierarchyHelper.h
index c303942dd5..f8a1b046e9 100644
--- a/src/ifcparse/IfcHierarchyHelper.h
+++ b/src/ifcparse/IfcHierarchyHelper.h
@@ -330,6 +330,10 @@ aggregate_of_instance::ptr get_children_of_relation(Ifc4x3_add2::IfcRelAggregate
     return t->RelatedObjects()->generalize();
 }
 
+aggregate_of_instance::ptr get_children_of_relation(Ifc4x3_add2::IfcRelNests* t) {
+    return t->RelatedObjects()->generalize();
+}
+
 void set_children_of_relation(Ifc4x3_add2::IfcRelContainedInSpatialStructure* t, aggregate_of_instance::ptr& cs) {
     t->setRelatedElements(cs->as<Ifc4x3_add2::IfcProduct>());
 }
@@ -337,6 +341,10 @@ void set_children_of_relation(Ifc4x3_add2::IfcRelContainedInSpatialStructure* t,
 void set_children_of_relation(Ifc4x3_add2::IfcRelAggregates* t, aggregate_of_instance::ptr& cs) {
     t->setRelatedObjects(cs->as<Ifc4x3_add2::IfcObjectDefinition>());
 }
+
+void set_children_of_relation(Ifc4x3_add2::IfcRelNests* t, aggregate_of_instance::ptr& cs) {
+    t->setRelatedObjects(cs->as<Ifc4x3_add2::IfcObjectDefinition>());
+}
 #endif
 
 IfcUtil::IfcBaseClass* get_parent_of_relation(IfcUtil::IfcBaseClass* t) {