diff --git a/htdocs/core/modules/supplier_order/doc/pdf_cornas.modules.php b/htdocs/core/modules/supplier_order/doc/pdf_cornas.modules.php
index c83863339c2..186ea465568 100644
--- a/htdocs/core/modules/supplier_order/doc/pdf_cornas.modules.php
+++ b/htdocs/core/modules/supplier_order/doc/pdf_cornas.modules.php
@@ -1623,7 +1623,7 @@ class pdf_cornas extends ModelePDFSuppliersOrders
 			),
 			'border-left' => true, // add left line separator
 		);
-		if (!empty($conf->global->PRODUCT_USE_UNITS)) {
+		if (getDolGlobalInt('PRODUCT_USE_UNITS')) {
 			$this->cols['unit']['status'] = true;
 		}