diff --git a/tox.ini b/tox.ini
index 1cf5f7fd..a614f9bf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -77,6 +77,7 @@ commands = {posargs}
 setenv =
     PYTHON=coverage run --source cyborg --parallel-mode
 commands =
+    coverage erase
     stestr run {posargs}
     coverage combine
     coverage html -d cover