diff --git a/htdocs/lib/functions.lib.php b/htdocs/lib/functions.lib.php
index 2b56ceabceb..727a03690ef 100644
--- a/htdocs/lib/functions.lib.php
+++ b/htdocs/lib/functions.lib.php
@@ -4030,11 +4030,14 @@ function utf8_check($str)
 /**
  *      Return an UTF-8 string encoded into OS filesystem encoding. This function is used to define
  * 	    value to pass to filesystem PHP functions.
- *      @param      $str        String to encode (UTF-8)
- * 		@return		string		Encoded string (UTF-8, ISO-8859-1)
+ *
+ *      @param      string	$str        String to encode (UTF-8)
+ * 		@return		string				Encoded string (UTF-8, ISO-8859-1)
  */
 function dol_osencode($str)
 {
+    global $conf;
+
     $tmp=ini_get("unicode.filesystem_encoding");						// Disponible avec PHP 6.0
     if (empty($tmp) && ! empty($_SERVER["WINDIR"])) $tmp='iso-8859-1';	// By default for windows
     if (empty($tmp)) $tmp='utf-8';										// By default for other