diff --git a/webui/system/language.php b/webui/system/language.php
index cf144099..e52443cd 100644
--- a/webui/system/language.php
+++ b/webui/system/language.php
@@ -11,6 +11,7 @@ class Language {
 
       if(isset($_SESSION['lang'])) {
          $file = DIR_LANGUAGE . $_SESSION['lang'] . '/messages.php';
+         define('LANG', $_SESSION['lang']);
       }
       else {
          $pref_langs = $this->get_preferred_languages();
diff --git a/webui/system/misc.php b/webui/system/misc.php
index b72c4b20..b27721c0 100644
--- a/webui/system/misc.php
+++ b/webui/system/misc.php
@@ -74,6 +74,7 @@ function logout() {
 
    Registry::set('username', '');
 
+   session_destroy();
 }