diff --git a/tox.ini b/tox.ini
index dac68872d1af..9707d2813b0b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -65,6 +65,7 @@ commands = oslopolicy-sample-generator --config-file=etc/nova/nova-policy-genera
 # tests conflict with coverage.
 commands =
   coverage erase
+  find . -type f -name "*.pyc" -delete
   python setup.py testr --coverage --testr-args='{posargs}'
 
 [testenv:venv]