1 files changed, 1 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index 889017fb3..6c0e01db6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,7 +41,7 @@ deps =
 docker =
   docker: zookeeper:3.4
 commands =
-  bash -c 'stestr run --slowest --concurrency=`python -c "import multiprocessing; print(int(multiprocessing.cpu_count()/2))"` {posargs}'
+  bash -c 'stestr run --slowest {posargs}'
 
 [testenv:bindep]
 # Do not install any requirements. We want this to be fast and work even if