diff --git a/oauth/authorize.php b/oauth/authorize.php
index 1b1defd..51813ac 100644
--- a/oauth/authorize.php
+++ b/oauth/authorize.php
@@ -111,7 +111,7 @@ if (empty($_POST)) {
 
 // print the authorization code if the user has authorized your client
 $is_authorized = ($_POST['authorized'] === 'Authorize');
-$server->handleAuthorizeRequest($request, $response, $is_authorized,$_SESSION['uid']);
+$server->handleAuthorizeRequest($request, $response, $is_authorized,strtolower($_SESSION['uid']));
 
 if ($is_authorized) 
 {
diff --git a/oauth/connexion.php b/oauth/connexion.php
index 57edba1..6bd2480 100644
--- a/oauth/connexion.php
+++ b/oauth/connexion.php
@@ -33,7 +33,7 @@ else
    		// Remove every html tag and useless space on username (to prevent XSS)
    	   	$user=strip_tags(trim($_POST['user']));
 
-    	$user=$_POST['user'];
+    	$user=strtolower($_POST['user']);
     	$password=$_POST['password'];
 
     	// Open a LDAP connection