diff --git a/apps/user_ldap/lib/Migration/Version1120Date20210917155206.php b/apps/user_ldap/lib/Migration/Version1120Date20210917155206.php
index d2b440c4dfe..87a8f07fbe1 100644
--- a/apps/user_ldap/lib/Migration/Version1120Date20210917155206.php
+++ b/apps/user_ldap/lib/Migration/Version1120Date20210917155206.php
@@ -127,9 +127,10 @@ class Version1120Date20210917155206 extends SimpleMigrationStep {
 
 	protected function getSelectQuery(string $table): IQueryBuilder {
 		$qb = $this->dbc->getQueryBuilder();
+		$lengthExpr = $this->dbc->getDatabasePlatform()->getLengthExpression('owncloud_name');
 		$qb->select('owncloud_name', 'directory_uuid')
 			->from($table)
-			->where($qb->expr()->like('owncloud_name', $qb->createNamedParameter(str_repeat('_', 65) . '%'), Types::STRING));
+			->where($qb->expr()->gt($qb->createFunction($lengthExpr), '64', IQueryBuilder::PARAM_INT));
 		return $qb;
 	}