diff --git a/tests/php/Core/Manifest/ManifestFileFinderTest.php b/tests/php/Core/Manifest/ManifestFileFinderTest.php
index e3c45bbea..ee9d5a10e 100644
--- a/tests/php/Core/Manifest/ManifestFileFinderTest.php
+++ b/tests/php/Core/Manifest/ManifestFileFinderTest.php
@@ -105,6 +105,7 @@ class ManifestFileFinderTest extends SapphireTest
             $finder,
             dirname(__FILE__) . '/fixtures/manifestfilefinder_rootconfigfolder',
             array(
+                '_config/config.yml',
                 'code/code.txt',
             )
         );
diff --git a/tests/php/Core/Manifest/fixtures/manifestfilefinder_rootconfigfolder/_config/config.yml b/tests/php/Core/Manifest/fixtures/manifestfilefinder_rootconfigfolder/_config/config.yml
new file mode 100644
index 000000000..e69de29bb