diff --git a/tox.ini b/tox.ini
index a155ec726386..df7784f0731f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,11 @@ isolated_build = true
 
 [testenv]
 description = run the test driver with {basepython}
-passenv = PYTEST_XDIST_WORKER_COUNT PROGRAMDATA PROGRAMFILES(X86) PYTEST_ADDOPTS
+passenv =
+    PYTEST_XDIST_WORKER_COUNT
+    PROGRAMDATA
+    PROGRAMFILES(X86)
+    PYTEST_ADDOPTS
 deps = -rtest-requirements.txt
 commands = python -m pytest {posargs}