diff --git a/tox.ini b/tox.ini
index c29d216..98bd35a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,11 +20,11 @@ commands = {toxinidir}/tools/cover.sh {posargs}
 
 [testenv:debug-py27]
 basepython = python2.7
-commands = oslo_debug_helper {posargs}
+commands = oslo_debug_helper -t sahara/tests/unit {posargs}
 
 [testenv:debug-py35]
 basepython = python3.5
-commands = oslo_debug_helper {posargs}
+commands = oslo_debug_helper -t sahara/tests/unit {posargs}
 
 [testenv:pep8]
 commands =
@@ -89,7 +89,7 @@ commands = pip-missing-reqs -d --ignore-file=sahara/tests/* sahara
 # in interactive mode, so, you could use pbr for tests debug.
 # Example usage: tox -e debug -- -t sahara/tests/unit some.test.path
 # http://docs.openstack.org/developer/oslotest/features.html#debugging-with-oslo-debug-helper
-commands = oslo_debug_helper {posargs}
+commands = oslo_debug_helper -t sahara/tests/unit {posargs}
 
 [testenv:bandit]
 deps = -r{toxinidir}/test-requirements-bandit.txt