diff --git a/tox.ini b/tox.ini
index 7bef4da..09925e3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -46,3 +46,4 @@ commands =
     pyflakes setup.py src
     wormhole --version
     coverage run --branch -m wormhole.test.run_trial {posargs:wormhole}
+    coverage xml