diff --git a/db/update.sql b/db/update.sql
index c2ebf441..dc254a02 100644
--- a/db/update.sql
+++ b/db/update.sql
@@ -1,8 +1,6 @@
 /* Update für #27, iCal-Export */
-ALTER TABLE `User` ADD `ical_key` VARCHAR( 32 ) NOT NULL ,
-ADD UNIQUE (
-`ical_key`
-);
+ALTER TABLE `User` ADD `ical_key` VARCHAR( 32 ) NOT NULL;
+ALTER TABLE `User` ADD INDEX ( `ical_key` ) 
 
 INSERT INTO `engelsystem`.`Privileges` (
 `id` ,