diff --git a/test/python/basis_transformation.py b/test/python/basis_transformation.py
index a180b999..25d93dcf 100644
--- a/test/python/basis_transformation.py
+++ b/test/python/basis_transformation.py
@@ -1,4 +1,3 @@
-from tkinter import W
 from triqs.utility.comparison_tests import *
 from triqs_dft_tools.sumk_dft import *
 import numpy as np