diff --git a/.gitignore b/.gitignore
index ca75bddd2..87a5a681c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,4 @@ doc/source/api/
 dist/
 .stestr/
 releasenotes/build
+cover/
diff --git a/tox.ini b/tox.ini
index 9d07185f8..d78015697 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,8 +24,13 @@ commands =
 
 [testenv:cover]
 basepython = python3
+setenv =
+    PYTHON=coverage run --source oslo_messaging --parallel-mode
 commands =
-  python setup.py test --coverage --coverage-package-name=oslo_messaging --testr-args='{posargs}'
+  stestr run --slowest {posargs}
+  coverage combine
+  coverage html -d cover
+  coverage report
 
 [testenv:venv]
 basepython = python3