From 14eef87c0d27ea75956598e3cd36a6a6cb181348 Mon Sep 17 00:00:00 2001
From: jxltom <jxltom@gmail.com>
Date: Sun, 21 Oct 2018 12:53:08 +0800
Subject: [PATCH] Do not add extra to markers when translating markers

---
 pipenv/utils.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pipenv/utils.py b/pipenv/utils.py
index b9345afa..b965e46d 100644
--- a/pipenv/utils.py
+++ b/pipenv/utils.py
@@ -1182,7 +1182,9 @@ def translate_markers(pipfile_entry):
     new_pipfile = dict(pipfile_entry).copy()
     marker_set = set()
     if "markers" in new_pipfile:
-        marker_set.add(str(Marker(new_pipfile.get("markers"))))
+        marker = str(Marker(new_pipfile.pop("markers")))
+        if 'extra' not in marker:
+            marker_set.add(marker)
     for m in pipfile_markers:
         entry = "{0}".format(pipfile_entry[m])
         if m != "markers":