diff --git a/screening/source/sql/postgresql/migration/migration-008-009.sql b/screening/source/sql/postgresql/migration/migration-008-009.sql
index 54d146739b65a4115b32e4e70ad2b102c6ce879b..44ca7e1de822638d67ba5149b37c28b7bedf8519 100644
--- a/screening/source/sql/postgresql/migration/migration-008-009.sql
+++ b/screening/source/sql/postgresql/migration/migration-008-009.sql
@@ -35,9 +35,9 @@ CREATE TRIGGER CHANNEL_STACKS_CHECK BEFORE INSERT OR UPDATE ON CHANNEL_STACKS
     
 --- for each spot set exactly one representative channel_stacks record (with minimal id) ---------
 
-update channel_stacks as cs
-   set cs.is_representative = 'T'
- where cs.id in (select min(cs.id) 
+update channel_stacks
+   set is_representative = 'T'
+ where id in (select min(cs.id) 
 		 from channel_stacks cs
 		 join spots on spots.id = cs.spot_id
 		 group by spots.id)
\ No newline at end of file