diff --git a/tests/lib/SimpleSAML/Store/RedisTest.php b/tests/lib/SimpleSAML/Store/RedisTest.php
index 690ad36da7cd66ea239daa3a8c7812a53a2b679b..c893fa3a970e9249007b0233773b0dc6cd1a7b60 100644
--- a/tests/lib/SimpleSAML/Store/RedisTest.php
+++ b/tests/lib/SimpleSAML/Store/RedisTest.php
@@ -130,7 +130,7 @@ class RedisTest extends TestCase
 
         $this->assertInstanceOf(Store\Redis::class, $store);
 
-        $this->clearInstance($config, Configuration::Class);
+        $this->clearInstance($config, configuration::Class);
         $this->clearInstance($store, Store::class);
     }