diff --git a/tox.ini b/tox.ini
index 59c6c5f4..ecd8e480 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,7 @@ 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 ironic_ui/test/tests {posargs}
 
 [flake8]