diff --git a/tox.ini b/tox.ini
index 325dbbd1..4e205ac2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ 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
   bash tools/pretty_tox.sh '{posargs}'