diff --git a/tox.ini b/tox.ini
index e00693dc2df4..a34da80449e2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,14 +29,15 @@ passenv = OS_DEBUG GENERATE_HASHES
 [testenv:py27]
 commands =
     {[testenv]commands}
-    env TEST_OSPROFILER=1 stestr run 'nova.tests.unit.test_profiler'
     stestr run {posargs}
+    env TEST_OSPROFILER=1 stestr run --combine --no-discover 'nova.tests.unit.test_profiler'
 
 [testenv:py35]
 commands =
     {[testenv]commands}
-    env TEST_OSPROFILER=1 stestr run 'nova.tests.unit.test_profiler'
     bash tools/pretty_tox3.sh '{posargs}'
+    env TEST_OSPROFILER=1 stestr run --combine --no-discover 'nova.tests.unit.test_profiler'
+
 
 [testenv:pep8]
 basepython = python2.7