diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index a68d0e34eea..2dc818fab92 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -301,7 +301,8 @@ if (defined("MAIN_MODULE_FACTURE"))
       require(DOL_DOCUMENT_ROOT ."/includes/modules/facture/".FACTURE_ADDON."/".FACTURE_ADDON.".modules.php");
 
   if (defined("FACTURE_ADDON_PDF"))
-    require(DOL_DOCUMENT_ROOT ."/includes/modules/facture/pdf_".FACTURE_ADDON_PDF.".modules.php");
+    if (is_readable(DOL_DOCUMENT_ROOT ."/includes/modules/facture/pdf_".FACTURE_ADDON_PDF.".modules.php"))
+      require(DOL_DOCUMENT_ROOT ."/includes/modules/facture/pdf_".FACTURE_ADDON_PDF.".modules.php");
 }
 if (defined("MAIN_MODULE_PROPALE"))
 {