diff --git a/include/konto.class.php b/include/konto.class.php
index c002e2f68..5fa0a5a79 100644
--- a/include/konto.class.php
+++ b/include/konto.class.php
@@ -721,7 +721,7 @@ class konto extends basis_db
 		$qry = "select sum(betrag) as betrag from public.tbl_konto 
 				join public.tbl_benutzer benutzer using(person_id)
 				where uid=".$this->db_add_param($uid)." and studiensemester_kurzbz = ".$this->db_add_param($stsem)." 
-				and buchungstyp_kurzbz = 'OEH' and betrag > 0";
+				and LOWER(buchungstyp_kurzbz) = LOWER('OEH') and betrag > 0";
 		if($studiengang_kz!= null)
 		$qry.=" and studiengang_kz = ".$this->db_add_param($studiengang_kz, FHC_INTEGER).";";