diff --git a/tests.py b/tests.py
index b7d4af5..2f86472 100644
--- a/tests.py
+++ b/tests.py
@@ -12,19 +12,22 @@
 
 
 class AttributiveTranslationsTest(TestCase):
+    def setUp(self):
+        empty_mo_file.seek(0)
+
     def test_value_returned_is_userstring(self):
         value_returned = AttributiveTranslations(empty_mo_file).gettext('foo')
         self.assertIsInstance(value_returned, UserString)
 
     def test_is_attributive(self):
-        t = AttributiveTranslations()
+        t = AttributiveTranslations(empty_mo_file)
         t._catalog = {'attribute\x04foo': 'bar'}
 
         foo = t.gettext('foo')
         self.assertEqual('bar', foo.attribute)
 
     def test_fallbacks(self):
-        t = AttributiveTranslations()
+        t = AttributiveTranslations(empty_mo_file)
         t._catalog = {'user': 'użytkownik'}
 
         message = t.gettext('user')