diff --git a/htdocs/lib/functions.inc.php b/htdocs/lib/functions.inc.php
index b4d1f46b170..92e329240c0 100644
--- a/htdocs/lib/functions.inc.php
+++ b/htdocs/lib/functions.inc.php
@@ -78,6 +78,13 @@ function check_mail ($mail)
     }
 }
 
+function unaccent($str)
+{
+  $acc = array("à","ä","é","è","ë","ï","î","ö","ô","ù","ü");
+  $uac = array("a","a","e","e","e","i","i","o","o","u","u");
+
+  return str_replace($acc, $uac, $str);
+}
 
 /**
    \brief       Envoi des messages dolibarr dans syslog ou dans un fichier