diff --git a/tox.ini b/tox.ini
index 46a8097e..94ac6913 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,6 +16,7 @@ python =
 
 [testenv]
 setenv = PYWB_NO_VERIFY_SSL = 1
+passenv = *
 deps =
     -rtest_requirements.txt
     -rrequirements.txt