diff --git a/admin/sync/fas/sync_fas_vilesci_student.php b/admin/sync/fas/sync_fas_vilesci_student.php
index b67090249..13d7a8c67 100644
--- a/admin/sync/fas/sync_fas_vilesci_student.php
+++ b/admin/sync/fas/sync_fas_vilesci_student.php
@@ -124,7 +124,7 @@ p2.aufnahmeschluessel AS aufnahmeschluessel2, p2.aufnahmeschluessel_fk AS aufnah
 FROM (person JOIN student ON person_pk=student.person_fk ) AS p1 
 CROSS JOIN (person JOIN student ON person_pk=student.person_fk) AS p2 WHERE 
 ((p1.svnr=p2.svnr AND p1.svnr IS NOT NULL AND p1.svnr<>'') 
-	OR (p1.svnr<>p2.svnr AND p1.svnr IS NOT NULL AND p1.svnr<>'' AND p1.familienname=p2.familienname AND p1.familienname IS NOT NULL AND p1.familienname!='' 
+	OR ((p1.svnr<>p2.svnr OR p1.svnr IS NOT NULL OR p1.svnr<>'') AND p1.familienname=p2.familienname AND p1.familienname IS NOT NULL AND p1.familienname!='' 
 	AND p1.gebdat=p2.gebdat AND p1.gebdat IS NOT NULL AND p1.gebdat>'1935-01-01' AND p1.gebdat<'2000-01-01'))
 AND (p1.person_pk < p2.person_pk) 
 AND (p1.svnr<>'0005010400' AND p2.svnr<>'0005010400')