diff --git a/custom_set_up.py b/custom_set_up.py
index 2676824..0973b0e 100644
--- a/custom_set_up.py
+++ b/custom_set_up.py
@@ -5,7 +5,6 @@
 # this set-up only works for IPython and Jupyter versions after 
 # the so called the "big splitt" (version 4 and higher).
 import os
-import sys
 import jupyter_core
 import IPython
 import shutil