diff --git a/htdocs/master.inc.php b/htdocs/master.inc.php
index 5b27d89707d..96108a64fd6 100644
--- a/htdocs/master.inc.php
+++ b/htdocs/master.inc.php
@@ -27,6 +27,7 @@ define('DOL_VERSION','1.2.0-DEV');
 
 define_syslog_variables();
 
+ini_set('mbstring.func_overload','0');
 
 if (! @include_once("conf/conf.php"))
 {