diff --git a/lib/classes/StudipMemoryCache.class.php b/lib/classes/StudipMemoryCache.class.php
index 395475d415c95de835a20abbe34baecf075a78d7..57b35f9a4dfd5d827cfbb8478a0fde3d66d7aae8 100644
--- a/lib/classes/StudipMemoryCache.class.php
+++ b/lib/classes/StudipMemoryCache.class.php
@@ -60,7 +60,7 @@ class StudipMemoryCache implements StudipCache
     public function write($name, $content, $expires = self::DEFAULT_EXPIRATION)
     {
         $this->memory_cache[$name] = [
-            'expires' => time() + $expire,
+            'expires' => time() + $expires,
             'data'    => $content,
         ];