diff --git a/module/finc/sql/migrations/mysql/migrateData_Vufind1ToVufind5_Common.sql b/module/finc/sql/migrations/mysql/migrateData_Vufind1ToVufind5_Common.sql
index 8717ced29bc9fefe0b4a026e64f43bd22ce87678..88bb3096c02e6c8a37ce86cff0b33517bed03a39 100644
--- a/module/finc/sql/migrations/mysql/migrateData_Vufind1ToVufind5_Common.sql
+++ b/module/finc/sql/migrations/mysql/migrateData_Vufind1ToVufind5_Common.sql
@@ -194,14 +194,6 @@ ALTER TABLE session
   MODIFY COLUMN data mediumtext,
   MODIFY COLUMN created datetime NOT NULL DEFAULT '2000-01-01 00:00:00';
   
--- Apply constraint modifications  
-
-ALTER TABLE session
-   DROP INDEX last_used;
-   
-ALTER TABLE session
-  ADD UNIQUE(last_used); 
-  
 -- Set chracter set to utf8  
 
 ALTER TABLE session