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-rw-r--r--tox/config.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tox/config.py b/tox/config.py
index de45138..5963f13 100644
--- a/tox/config.py
+++ b/tox/config.py
@@ -387,7 +387,7 @@ def tox_addoption(parser):
help="list of X=Y lines with environment variable settings")
def passenv(testenv_config, value):
- passenv = set(["PATH"])
+ passenv = set(["PATH", "PIP_INDEX_URL"])
# we ensure that tmp directory settings are passed on
# we could also set it to the per-venv "envtmpdir"