diff --git a/setup.py b/setup.py
index 3e52e18d..d6261388 100644
--- a/setup.py
+++ b/setup.py
@@ -5,6 +5,7 @@ from setuptools import setup
 from setuptools import find_packages
 
 import os
+import sys
 
 # required to load VERSION_STRING constant
 sys.path.insert(0, './searx')