diff --git a/tox.ini b/tox.ini
index d415d55e..3e5b00ec 100644
--- a/tox.ini
+++ b/tox.ini
@@ -47,7 +47,8 @@ commands =
     python -V
     coverage --version
     asyncio: coverage run --source {envsitepackagesdir}/autobahn/ {envbindir}/py.test {envsitepackagesdir}/autobahn/
-    tw121,tw132,tw154,tw165,twtrunk: coverage run {envbindir}/trial autobahn
+    tw121,tw132,tw154: coverage run {envbindir}/trial autobahn
+    tw165,twtrunk: coverage run -m twisted.trial autobahn
     coverage report
 
 whitelist_externals = sh