diff --git a/library/Director/Db/Cache/CustomVariableCache.php b/library/Director/Db/Cache/CustomVariableCache.php
index 243ecae94..ee2b9ef74 100644
--- a/library/Director/Db/Cache/CustomVariableCache.php
+++ b/library/Director/Db/Cache/CustomVariableCache.php
@@ -76,9 +76,4 @@ public function getVarsForObject(IcingaObject $object)
             return new CustomVariables();
         }
     }
-
-    public function __destruct()
-    {
-        unset($this->db);
-    }
 }