diff --git a/tests/ironic_lib/test_disk_utils.py b/tests/ironic_lib/test_disk_utils.py
index b00063d9..86a5c978 100644
--- a/tests/ironic_lib/test_disk_utils.py
+++ b/tests/ironic_lib/test_disk_utils.py
@@ -225,7 +225,7 @@ class MakePartitionsTestCase(test_base.BaseTestCase):
                                    self.ephemeral_mb, self.configdrive_mb)
 
         parted_call = mock.call(*cmd, run_as_root=True, check_exit_code=[0])
-        mock_exc.assert_has_calls(parted_call)
+        mock_exc.assert_has_calls([parted_call])
 
 
 @mock.patch.object(disk_utils, 'get_dev_block_size')