diff --git a/tests/scipy-notebook/data/cython/setup.py b/tests/scipy-notebook/data/cython/setup.py
index 489df0c4..2ad2140c 100644
--- a/tests/scipy-notebook/data/cython/setup.py
+++ b/tests/scipy-notebook/data/cython/setup.py
@@ -1,4 +1,6 @@
-from Cython.Build import cythonize
-from setuptools import setup
+# These lines are not sorted by isort on purpose
+# see: https://stackoverflow.com/a/53356077/4881441
+from setuptools import setup  # isort:skip
+from Cython.Build import cythonize  # isort:skip
 
 setup(ext_modules=cythonize("helloworld.pyx"))