diff --git a/htdocs/lib/security.lib.php b/htdocs/lib/security.lib.php
index 5652895754ae9269817868187dc1227ccf131ab0..47924bda57c732ee8cb59c717bf4ec39c71c6344 100644
--- a/htdocs/lib/security.lib.php
+++ b/htdocs/lib/security.lib.php
@@ -41,6 +41,7 @@ function dol_loginfunction($langs,$conf,$mysoc)
 	if (file_exists(DOL_DOCUMENT_ROOT.'/'.$conf->css.".php")) $conf->css.=".php";
 
 	header('Cache-Control: Public, must-revalidate');
+	header("Content-type: text/html; charset=".$conf->character_set_client);
 
 	if (! empty($_REQUEST["urlfrom"])) $_SESSION["urlfrom"]=$_REQUEST["urlfrom"];
 	else unset($_SESSION["urlfrom"]);