diff --git a/htdocs/core/actions_massactions.inc.php b/htdocs/core/actions_massactions.inc.php
index 4bb070e2ac0..de586e80e9f 100644
--- a/htdocs/core/actions_massactions.inc.php
+++ b/htdocs/core/actions_massactions.inc.php
@@ -841,7 +841,7 @@ if (!$error && $massaction == "builddoc" && $permissiontoread && !GETPOST('butto
 		}
 		$pdf->SetFont(pdf_getPDFFont($outputlangs));
 
-		if (!empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) {
+		if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 			$pdf->SetCompression(false);
 		}