diff --git a/htdocs/fourn/class/fournisseur.commande.class.php b/htdocs/fourn/class/fournisseur.commande.class.php
index ced75842606..bb0f8724907 100644
--- a/htdocs/fourn/class/fournisseur.commande.class.php
+++ b/htdocs/fourn/class/fournisseur.commande.class.php
@@ -9,6 +9,7 @@
  * Copyright (C) 2013       Florian Henry		  	<florian.henry@open-concept.pro>
  * Copyright (C) 2013       Cédric Salvador         <csalvador@gpcsolutions.fr>
  * Copyright (C) 2018       Nicolas ZABOURI			<info@inovea-conseil.com>
+ * Copyright (C) 2018       Frédéric France         <frederic.france@netlogic.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -800,8 +801,7 @@ class CommandeFournisseur extends CommonOrder
                 $mybool|=@include_once $dir.$file;
             }
 
-            if (! $mybool)
-            {
+            if ($mybool === false) {
                 dol_print_error('',"Failed to include file ".$file);
                 return '';
             }