diff --git a/tox.ini b/tox.ini
index 0376ab28e..98ca90c39 100644
--- a/tox.ini
+++ b/tox.ini
@@ -49,9 +49,8 @@ commands =
          tahoe --version
 
 [testenv:py36]
-# On macOS, git inside of ratchet.sh needs $HOME.
-passenv = {[testenv]passenv} HOME
-commands = {toxinidir}/misc/python3/ratchet.sh
+commands =
+         trial {env:TAHOE_LAFS_TRIAL_ARGS:--rterrors} {posargs:allmydata.test.python3_tests}
 
 [testenv:integration]
 setenv =