diff --git a/test/test_tileset.py b/test/test_tileset.py
index 9f9b862..9cde942 100644
--- a/test/test_tileset.py
+++ b/test/test_tileset.py
@@ -184,6 +184,7 @@ class TilesetTest(unittest.TestCase):
         is called before do_preprocessing()
         """
         defoptions = {
+                'name': 'world name',
                 'bgcolor': '#000000',
                 'imgformat': 'png',
                 'optimizeimg': 0,