diff --git a/installer/data/mysql/updatedatabase.pl b/installer/data/mysql/updatedatabase.pl
index 7a01014120..597174ba93 100755
--- a/installer/data/mysql/updatedatabase.pl
+++ b/installer/data/mysql/updatedatabase.pl
@@ -8427,12 +8427,11 @@ if ( C4::Context->preference("Version") < TransformToNum($DBversion) ) {
     ");
 
     $dbh->do("ALTER TABLE deletedbiblioitems DROP INDEX isbn");
-    $dbh->do("ALTER TABLE deletedbiblioitems DROP INDEX issn");
     $dbh->do("ALTER TABLE deletedbiblioitems
               CHANGE isbn isbn MEDIUMTEXT NULL DEFAULT NULL,
               CHANGE issn issn MEDIUMTEXT NULL DEFAULT NULL
     ");
-    $dbh->do("ALTER TABLE deletedbiblioitems 
+    $dbh->do("ALTER TABLE deletedbiblioitems
               ADD INDEX isbn ( isbn ( 255 ) )
     ");