diff --git a/tox.ini b/tox.ini
index e8b1901abbbc..a9cd918bf6b5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -30,6 +30,7 @@ commands =
 deps =
     {[testenv:cover]deps}
     coveralls
+passenv = {[testenv:regression]passenv}
 
 [testenv:docs]
 basepython =