diff --git a/lam/lib/import.inc b/lam/lib/import.inc
index 246e3becf..6e280fcbb 100644
--- a/lam/lib/import.inc
+++ b/lam/lib/import.inc
@@ -496,7 +496,7 @@ class RenameEntryTask implements ImporterTask {
 	 */
 	public function run() {
 		$ldap = $_SESSION['ldap']->server();
-		$success = @ldap_rename($ldap, $this->dn, $this->newRdn, null, $this->deleteOldRdn);
+		$success = @ldap_rename($ldap, $this->dn, $this->newRdn, '', $this->deleteOldRdn);
 		if ($success) {
 			return Importer::formatMessage('INFO', _('Rename successful!'), htmlspecialchars($this->dn));
 		}