diff --git a/test-requirements.txt b/test-requirements.txt
index 1ce69dd2b..ed48f2ef0 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -23,6 +23,7 @@ testrepository>=0.0.18 # Apache-2.0/BSD
 testtools>=1.4.0 # MIT
 oslo.db>=4.15.0 # Apache-2.0
 testresources>=0.2.4 # Apache-2.0/BSD
+os-testr>=0.8.0  # Apache-2.0
 
 # Documentation
 sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
diff --git a/tox.ini b/tox.ini
index 2a26553a6..037f286a8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,7 @@ deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
     find . -type f -name "*.pyc" -delete
-    python setup.py testr --slowest --testr-args='--concurrency 1 {posargs}'
+    ostestr --concurrency 1 {posargs}
 whitelist_externals = find
 
 [testenv:pypy]
@@ -25,7 +25,7 @@ setenv = {[testenv]setenv}
 setenv = {[testenv]setenv}
          ZAQAR_TEST_INTEGRATION=1
          OS_TEST_PATH=./zaqar/tests/functional
-commands = python setup.py testr --slowest --testr-args='--concurrency 1 {posargs}'
+commands = ostestr --concurrency 1 {posargs}
 
 [testenv:pep8]
 commands = flake8