diff --git a/include/functions.php b/include/functions.php
index d40c5152..be38f839 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -14,7 +14,7 @@ if(!isset($_SESSION['theme'])) {
 }
 
 if(isset($_GET['theme'])) {
-    $_SESSION['theme'] = $themes[(int)$_SESSION['theme'] % 2];
+    $_SESSION['theme'] = $themes[(int)$_GET['theme'] % 2];
 }
 
 function nav($nav) {