diff --git a/tox.ini b/tox.ini
index b6625e7a3..8041abb07 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,7 +23,7 @@ commands =
     {env:_PYTEST_TOX_COVERAGE_RUN:} pytest --lsof {posargs}
     coverage: coverage combine
     coverage: coverage report
-passenv = USER USERNAME COVERAGE_* TRAVIS
+passenv = USER USERNAME COVERAGE_* TRAVIS PYTEST_ADDOPTS
 setenv =
     # Configuration to run with coverage similar to Travis/Appveyor, e.g.
     # "tox -e py37-coverage".