diff --git a/include/functions.php b/include/functions.php
index 7ecffb45..b797677c 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -10,10 +10,10 @@ if(!isset($_SESSION['role'])) {
 }
 
 if(isset($_GET['theme'])) {
-    $_SESSION['theme'] = (int)$_GET['theme'] % 3;
+    setcookie('theme', (int)$_GET['theme'] % 3, time()+10*60*60);
 }
 
-$theme = $themes[$_SESSION['theme']];
+$theme = $themes[$_COOKIE['theme']];
 
 
 function nav($nav) {