diff --git a/library/Businessprocess/ProvidedHook/Icingadb/ServiceDetailExtension.php b/library/Businessprocess/ProvidedHook/Icingadb/ServiceDetailExtension.php
index d2fb173..6d10af2 100644
--- a/library/Businessprocess/ProvidedHook/Icingadb/ServiceDetailExtension.php
+++ b/library/Businessprocess/ProvidedHook/Icingadb/ServiceDetailExtension.php
@@ -16,7 +16,7 @@ use ipl\Html\ValidHtml;
 
 class ServiceDetailExtension extends ServiceDetailExtensionHook
 {
-    /** @var LegacyStorage */
+    /** @var ?LegacyStorage */
     private $storage;
 
     /** @var string */
diff --git a/library/Businessprocess/ProvidedHook/Monitoring/DetailviewExtension.php b/library/Businessprocess/ProvidedHook/Monitoring/DetailviewExtension.php
index 9906df9..691acec 100644
--- a/library/Businessprocess/ProvidedHook/Monitoring/DetailviewExtension.php
+++ b/library/Businessprocess/ProvidedHook/Monitoring/DetailviewExtension.php
@@ -13,7 +13,7 @@ use Icinga\Module\Monitoring\Object\Service;
 
 class DetailviewExtension extends DetailviewExtensionHook
 {
-    /** @var LegacyStorage */
+    /** @var ?LegacyStorage */
     private $storage;
 
     /** @var string */