diff --git a/htdocs/core/modules/printing/printipp.modules.php b/htdocs/core/modules/printing/printipp.modules.php
index f290b2b4e90..02ba610961d 100644
--- a/htdocs/core/modules/printing/printipp.modules.php
+++ b/htdocs/core/modules/printing/printipp.modules.php
@@ -1,6 +1,6 @@
 <?php
 /*
- * Copyright (C) 2014-2020  Frederic France      <frederic.france@netlogic.fr>
+ * Copyright (C) 2014-2021  Frederic France      <frederic.france@netlogic.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -108,10 +108,10 @@ class printing_printipp extends PrintingDriver
 		global $conf;
 
 		$this->db = $db;
-		$this->host = $conf->global->PRINTIPP_HOST;
-		$this->port = $conf->global->PRINTIPP_PORT;
-		$this->user = $conf->global->PRINTIPP_USER;
-		$this->password = $conf->global->PRINTIPP_PASSWORD;
+		$this->host = getDolGlobalString('PRINTIPP_HOST');
+		$this->port = getDolGlobalString('PRINTIPP_PORT');
+		$this->user = getDolGlobalString('PRINTIPP_USER');
+		$this->password = getDolGlobalString('PRINTIPP_PASSWORD');
 		$this->conf[] = array('varname'=>'PRINTIPP_HOST', 'required'=>1, 'example'=>'localhost', 'type'=>'text');
 		$this->conf[] = array('varname'=>'PRINTIPP_PORT', 'required'=>1, 'example'=>'631', 'type'=>'text');
 		$this->conf[] = array('varname'=>'PRINTIPP_USER', 'required'=>0, 'example'=>'', 'type'=>'text', 'moreattributes'=>'autocomplete="off"');
@@ -159,8 +159,8 @@ class printing_printipp extends PrintingDriver
 				$ipp->setCopies($obj->copy);
 			} else {
 				if (!empty($conf->global->PRINTIPP_URI_DEFAULT)) {
-					dol_syslog("Will use default printer conf->global->PRINTIPP_URI_DEFAULT = ".$conf->global->PRINTIPP_URI_DEFAULT);
-					$ipp->setPrinterURI($conf->global->PRINTIPP_URI_DEFAULT);
+					dol_syslog("Will use default printer conf->global->PRINTIPP_URI_DEFAULT = ".getDolGlobalString('PRINTIPP_URI_DEFAULT'));
+					$ipp->setPrinterURI(getDolGlobalString('PRINTIPP_URI_DEFAULT'));
 				} else {
 					$this->errors[] = 'NoDefaultPrinterDefined';
 					$error++;