diff --git a/htdocs/core/lib/invoice2.lib.php b/htdocs/core/lib/invoice2.lib.php
index 64365f32547..da01d93fc62 100644
--- a/htdocs/core/lib/invoice2.lib.php
+++ b/htdocs/core/lib/invoice2.lib.php
@@ -239,7 +239,7 @@ function rebuild_merge_pdf($db, $langs, $conf, $diroutputpdf, $newlangid, $filte
 			}
 			$pdf->SetFont(pdf_getPDFFont($langs));
 
-			if ($conf->global->MAIN_DISABLE_PDF_COMPRESSION) {
+			if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 				$pdf->SetCompression(false);
 			}
 			//$pdf->SetCompression(false);