diff --git a/tests/test_inlinekeyboardmarkup.py b/tests/test_inlinekeyboardmarkup.py
index 3a4baf974..0813b3d19 100644
--- a/tests/test_inlinekeyboardmarkup.py
+++ b/tests/test_inlinekeyboardmarkup.py
@@ -33,8 +33,11 @@ class InlineKeyboardMarkupTest(BaseTest, unittest.TestCase):
     """This object represents Tests for Telegram KeyboardButton."""
 
     def setUp(self):
-        self.inline_keyboard = [[telegram.InlineKeyboardButton(text='button1'),
-                                 telegram.InlineKeyboardButton(text='button2')]]
+        self.inline_keyboard = \
+            [[telegram.InlineKeyboardButton(text='button1',
+                                            callback_data='data1'),
+              telegram.InlineKeyboardButton(text='button2',
+                                            callback_data='data2')]]
 
         self.json_dict = {
             'inline_keyboard': [[self.inline_keyboard[0][0].to_dict(),