diff --git a/Document/Structure/ArticleBridge.php b/Document/Structure/ArticleBridge.php
index 3616f2b5..9e46f4f5 100644
--- a/Document/Structure/ArticleBridge.php
+++ b/Document/Structure/ArticleBridge.php
@@ -94,6 +94,9 @@ public function setWebspaceKey($webspace)
 
     public function getCacheLifeTime()
     {
-        return $this->structure->getCacheLifetime();
+        /** @var array{type: string, value: string} $cacheLifetime */
+        $cacheLifetime = $this->structure->getCacheLifetime();
+
+        return $cacheLifetime;
     }
 }