1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index e345c167c..94fd1da26 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ deps =
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 commands =
-    stestr run {posargs}
+    stestr run --slowest {posargs}
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:unit-with-driver-libs]