diff --git a/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php b/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php
index 2bdda4421dc..8ebd1051a06 100644
--- a/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php
+++ b/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php
@@ -1319,7 +1319,7 @@ class pdf_standard_asset extends ModelePDFAsset
 			),
 			'border-left' => true, // add left line separator
 		);
-		if (!empty($conf->global->PRODUCT_USE_UNITS)) {
+		if (getDolGlobalInt('PRODUCT_USE_UNITS')) {
 			$this->cols['unit']['status'] = true;
 		}