diff --git a/IPython/core/tests/test_iplib.py b/IPython/core/tests/test_iplib.py
index 748723833e4..c5e065005f0 100644
--- a/IPython/core/tests/test_iplib.py
+++ b/IPython/core/tests/test_iplib.py
@@ -2,6 +2,7 @@
 """
 
 import stack_data
+import sys
 
 SV_VERSION = tuple([int(x) for x in stack_data.__version__.split(".")[0:2]])