diff --git a/pytim/willard_chandler.py b/pytim/willard_chandler.py
index 8074f21..0352d9f 100644
--- a/pytim/willard_chandler.py
+++ b/pytim/willard_chandler.py
@@ -5,8 +5,8 @@
     ========================
 """
 
-from typing import Optional
 from __future__ import print_function
+from typing import Optional
 from skimage import measure
 import numpy as np