diff --git a/htdocs/compta/prelevement/class/bonprelevement.class.php b/htdocs/compta/prelevement/class/bonprelevement.class.php
index 3f813e009380581f94ab32f676fbd44cdeacb4f3..62a2b01dd58893f1084d3405d0dd69b4999b8c61 100644
--- a/htdocs/compta/prelevement/class/bonprelevement.class.php
+++ b/htdocs/compta/prelevement/class/bonprelevement.class.php
@@ -1261,6 +1261,7 @@ class BonPrelevement extends CommonObject
 			$dateTime_ECMA = dol_print_date($date_actu, '%Y-%m-%dT%H:%M:%S');
 			$fileDebiteurSection = '';
 			$fileEmetteurSection = '';
+			$ListOfFactures = '';
 			$i = 0;
 			$j = 0;
 			$this->total = 0;
@@ -1277,7 +1278,7 @@ class BonPrelevement extends CommonObject
 				while ($j < $num)
 				{
 					$objfac = $this->db->fetch_object($resql);
-					$ListOfFactures = $ListOfFactures . $objfac->fac . ",";
+					$ListOfFactures .= ($j>0?',':'') . $objfac->fac;
 					$j++;
 				}
 			}