diff --git a/test/test_function_set.py b/test/test_function_set.py
index 482631b..93c8f5d 100644
--- a/test/test_function_set.py
+++ b/test/test_function_set.py
@@ -1,6 +1,7 @@
+from typing import Optional
+
 import pytest
 import six
-from typing import Optional
 
 import escpos.printer as printer
 from escpos.constants import SET_FONT, TXT_NORMAL, TXT_SIZE, TXT_STYLE