diff --git a/test/unittests/NDB_ConfigTest.php b/test/unittests/NDB_ConfigTest.php
index a41c451d6e9..1dbbea6b65a 100644
--- a/test/unittests/NDB_ConfigTest.php
+++ b/test/unittests/NDB_ConfigTest.php
@@ -31,6 +31,19 @@ class FakeConfig extends NDB_Config
     public function __construct()
     {
     }
+
+    /**
+     * Disable the settings cache for testing purposes.
+     *
+     * @param string $name The name of the setting to retrieve
+     *
+     * @return mixed The contents of the node identified by $name
+     */
+    function getSetting(string $name)
+    {
+        $this->settingCache = [];
+        return parent::getSetting($name);
+    }
 }
 /**
  * Unit test for NDB_Config class