1 files changed, 1 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index b09ddc3c6..64ccb7bdc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,7 +5,7 @@ envlist = docs,pep8,pylint,yamllint,bashate,py35,py27,perm,cover
 usedevelop = True
 deps =
   -c{toxinidir}/upper-constraints.txt
-  -chttps://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/queens
+  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/queens}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 install_command = pip install {opts} {packages}