diff --git a/htdocs/core/lib/pdf.lib.php b/htdocs/core/lib/pdf.lib.php
index 621b06965e1..6be4eaf2a61 100644
--- a/htdocs/core/lib/pdf.lib.php
+++ b/htdocs/core/lib/pdf.lib.php
@@ -1033,7 +1033,7 @@ function pdf_getlinedesc($object,$i,$outputlangs,$hideref=0,$hidedesc=0,$issuppl
 	}
 	
 	// Add an additional description for the category products
-	if ($conf->categorie->enabled)
+	if (! empty($conf->categorie->enabled))
 	{
 		include_once DOL_DOCUMENT_ROOT.'/categories/class/categorie.class.php';
 		$categstatic=new Categorie($db);