diff --git a/ccm-cms/sql/ccm-cms/default/upgrade/6.6.3-6.6.4/create_publish_lock_table.sql b/ccm-cms/sql/ccm-cms/default/upgrade/6.6.3-6.6.4/create_publish_lock_table.sql
index 5b6454531..248cc033c 100644
--- a/ccm-cms/sql/ccm-cms/default/upgrade/6.6.3-6.6.4/create_publish_lock_table.sql
+++ b/ccm-cms/sql/ccm-cms/default/upgrade/6.6.3-6.6.4/create_publish_lock_table.sql
@@ -5,5 +5,7 @@ CREATE TABLE cms_publish_lock (
     action character varying(256)
 );
 
+ALTER TABLE ONLY cms_publish_lock
+    ADD CONSTRAINT cms_publis_loc_lock_id_p_8n7d0 PRIMARY KEY (lock_id);
 
 -- ALTER TABLE public.cms_publish_lock OWNER TO ccm;
\ No newline at end of file