diff --git a/test/index.test.js b/test/index.test.js
index 0da8715c..91f7fbb4 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -80,7 +80,7 @@ describe('cosmiconfig', () => {
       stopDir: __dirname,
       cache: false,
       searchPlaces: ['.foorc.json', 'wildandfree.js'],
-      packageFilenames: 'manifest.json',
+      packageFilenames: ['manifest.json'],
       packageProp: 'wildandfree',
       ignoreEmptySearchPlaces: false,
       loaders: {