diff --git a/test/test_utils.py b/test/test_utils.py
index ab41ea404..5e7b8e19a 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -540,13 +540,13 @@ class FormatTestCase(SupyTestCase):
                          'apples, oranges, and watermelon.')
 
     def testPercentL(self):
-        self.assertIn(format('%L', {'apples', 'oranges', 'watermelon'}), {
+        self.assertIn(format('%L', set(('apples', 'oranges', 'watermelon'])), [
                          'apples, oranges, and watermelon',
                          'oranges, apples, and watermelon',
                          'apples, watermelon, and oranges',
                          'oranges, watermelon, and apples',
                          'watermelon, apples, and oranges',
-                         'watermelon, oranges, and apples'})
+                         'watermelon, oranges, and apples'])
 
         self.assertEqual(format('%L',
             (['apples', 'oranges', 'watermelon'], 'or')),