diff --git a/tox.ini b/tox.ini
index 6ecdb74c..47073c01 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ install_command = pip install -U {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
-    find . -type f -name "*.pyc" -delete
+    find . -type f -name "*.py[c|o]" -delete
     python setup.py testr --slowest --testr-args='{posargs}'
 whitelist_externals = find