diff --git a/pipenv/patched/notpip/_internal/pep425tags.py b/pipenv/patched/notpip/_internal/pep425tags.py
index c2a1e346..16d041d9 100644
--- a/pipenv/patched/notpip/_internal/pep425tags.py
+++ b/pipenv/patched/notpip/_internal/pep425tags.py
@@ -3,6 +3,7 @@ from __future__ import absolute_import
 
 import distutils.util
 import logging
+import os
 import platform
 import re
 import sys