diff --git a/htdocs/compta/facture/impayees.php b/htdocs/compta/facture/impayees.php
index 0b9203df4da..4e8506adc3f 100644
--- a/htdocs/compta/facture/impayees.php
+++ b/htdocs/compta/facture/impayees.php
@@ -55,7 +55,9 @@ if ($_POST["action"] == "builddoc" && $user->rights->facture->lire)
         require_once(DOL_DOCUMENT_ROOT."/includes/fpdf/fpdfi/fpdi.php");
         require_once(DOL_DOCUMENT_ROOT.'/lib/pdf.lib.php');
 
-		$factures = dol_dir_list($conf->facture->dir_output,'all',1,implode('\.pdf|',$_POST['toGenerate']).'\.pdf','\.meta$|\.png','date',SORT_DESC) ;
+	    $arrayofexclusion=array();
+	    foreach($_POST['toGenerate'] as $tmppdf) $arrayofexclusion[]=preg_quote($tmppdf.'.pdf','/');
+		$factures = dol_dir_list($conf->facture->dir_output,'all',1,implode('|',$arrayofexclusion),'\.meta$|\.png','date',SORT_DESC);
 
 		// liste les fichiers
 		$files = array() ;
@@ -63,7 +65,7 @@ if ($_POST["action"] == "builddoc" && $user->rights->facture->lire)
 		foreach($_POST['toGenerate'] as $basename){
 			foreach($factures as $facture){
 				if(strstr($facture["name"],$basename)){
-					$files[] = $conf->facture->dir_output.'/'.$basename.'/'.$facture["name"] ;
+					$files[] = $conf->facture->dir_output.'/'.$basename.'/'.$facture["name"];
 				}
 			}
 		}