diff --git a/ccm-core/sql/ccm-core/upgrade/default/6.6.3-6.6.4/remove_ds_legacy_entries.sql b/ccm-core/sql/ccm-core/upgrade/default/6.6.3-6.6.4/remove_ds_legacy_entries.sql
index cfb8ebebf..f504edd6c 100644
--- a/ccm-core/sql/ccm-core/upgrade/default/6.6.3-6.6.4/remove_ds_legacy_entries.sql
+++ b/ccm-core/sql/ccm-core/upgrade/default/6.6.3-6.6.4/remove_ds_legacy_entries.sql
@@ -56,8 +56,8 @@ delete from site_nodes
         );   
 -- Not needed anymore, see ccm-themedirector-6.6.1-6.6.2
 -- alter table site_nodes  add  constraint site_nodes_node_id_f_n1m2y
-                             FOREIGN KEY (node_id)
-                             REFERENCES acs_objects (object_id);
+--                             FOREIGN KEY (node_id)
+--                             REFERENCES acs_objects (object_id);