diff --git a/doc/source/contributor/topics/code-style.rst b/doc/source/contributor/topics/code-style.rst
index b639c9f319..676083f09b 100644
--- a/doc/source/contributor/topics/code-style.rst
+++ b/doc/source/contributor/topics/code-style.rst
@@ -338,7 +338,7 @@ Having done a release of an xstatic package:
    "include-pypi-link: yes" setting.
 2. Pull that patch down so you have the edited upper-constraints.txt file
    locally.
-3. Set the environment variable `UPPER_CONSTRAINTS_FILE` to the edited
+3. Set the environment variable `TOX_CONSTRAINTS_FILE` to the edited
    upper-constraints.txt file name and run tests or local development server
    through tox. This will pull in the precise version of the xstatic package
    that you need.
diff --git a/tox.ini b/tox.ini
index 0a88f7e974..e69b8312b3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,7 +20,7 @@ whitelist_externals =
   bash
   find
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
 commands =
@@ -123,7 +123,7 @@ commands =
 [testenv:docs]
 # We need to install horizon dependecies to build module references
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
 commands =