diff --git a/fs_test.go b/fs_test.go
index 7f79a72..470d9f8 100644
--- a/fs_test.go
+++ b/fs_test.go
@@ -159,7 +159,7 @@ func TestFSFolderLocal(t *testing.T) {
 func TestFSFolderIndex(t *testing.T) {
 	// create new FS
 	fs := NewFS(&staticFiles)
-	fs.IndexFilenames = []string{"README.md"}
+	fs.IndexFileNames = []string{"README.md"}
 
 	// serve the request
 	tw := &testWriter{}