diff --git a/htdocs/compta/facture.php b/htdocs/compta/facture.php
index ae3a8b08a72..4d6d3140047 100644
--- a/htdocs/compta/facture.php
+++ b/htdocs/compta/facture.php
@@ -1836,7 +1836,7 @@ else if ($action == 'print_file' AND $user->rights->printipp->read)
 {
 	require_once DOL_DOCUMENT_ROOT.'/core/class/dolprintipp.class.php';
 	$printer = new dolPrintIPP($db,$conf->global->PRINTIPP_HOST,$conf->global->PRINTIPP_PORT,$user->login,$conf->global->PRINTIPP_USER,$conf->global->PRINTIPP_PASSWORD);
-	$printer->print_file(GETPOST('file',alpha),GETPOST('printer',alpha));
+	$printer->print_file(GETPOST('file','alpha'),GETPOST('printer','alpha'));
     setEventMessage($langs->trans("FileWasSentToPrinter", GETPOST('file')));
     $action='';
 }