diff --git a/scripts/rally-runners/tox.ini b/scripts/rally-runners/tox.ini
index 8c548e3..846cd73 100644
--- a/scripts/rally-runners/tox.ini
+++ b/scripts/rally-runners/tox.ini
@@ -25,7 +25,7 @@ commands = python setup.py test --coverage --testr-args='{posargs}'
 commands = python setup.py build_sphinx
 
 [testenv:debug]
-commands = oslo_debug_helper {posargs}
+commands = oslo_debug_helper -t tests {posargs}
 
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.