diff --git a/htdocs/compta/prelevement/class/bonprelevement.class.php b/htdocs/compta/prelevement/class/bonprelevement.class.php
index a3d50d58143..99b087e1939 100644
--- a/htdocs/compta/prelevement/class/bonprelevement.class.php
+++ b/htdocs/compta/prelevement/class/bonprelevement.class.php
@@ -1503,7 +1503,7 @@ class BonPrelevement extends CommonObject
     static function buildRumNumber($row_code_client, $row_datec, $row_drum)
     {
         global $langs;
-		$pre = ($row_datec > 1359673200) ? $langs->trans('RUM').'-' : '++R';
+		$pre = $langs->trans('RUM').'-';
 		return $pre.$row_code_client.'-'.$row_drum.'-'.date('U', $row_datec);
     }