diff --git a/tox.ini b/tox.ini
index 19296d1a..c4adc971 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,7 @@ whitelist_externals = find
 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
   ostestr {posargs}
 
 [testenv:releasenotes]