diff --git a/Psr/Log/Test/LoggerInterfaceTest.php b/Psr/Log/Test/LoggerInterfaceTest.php
index 8e445ee..9ecb6c4 100644
--- a/Psr/Log/Test/LoggerInterfaceTest.php
+++ b/Psr/Log/Test/LoggerInterfaceTest.php
@@ -141,5 +141,6 @@ class DummyTest
 {
     public function __toString()
     {
+        return 'DummyTest';
     }
 }