diff --git a/include/functions.php b/include/functions.php
index e7b8ba96..b1af8669 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -9,7 +9,11 @@ if(!isset($_SESSION['role'])) {
     $_SESSION['role'] = 0;
 }
 
-$theme = isset($_GET['theme']) ? $themes[$_GET['theme']] : $themes[0];
+if(isset($_GET['theme'])) {
+    $_SESSION['theme'] = (int)$_GET['theme'] % 2;
+}
+
+$theme = $themes[$_SESSION['theme']];
 
 
 function nav($nav) {