diff --git a/installer/data/mysql/atomicupdate/bug_23260.pl b/installer/data/mysql/atomicupdate/bug_23260.pl
index 3626a9ae93..f50af49015 100755
--- a/installer/data/mysql/atomicupdate/bug_23260.pl
+++ b/installer/data/mysql/atomicupdate/bug_23260.pl
@@ -12,6 +12,7 @@ return {
         $dbh->do(
             q{
             ALTER TABLE items_last_borrower
+            MODIFY COLUMN borrowernumber int(11) NULL,
             MODIFY created_on timestamp NOT NULL DEFAULT current_timestamp()
         }
         );