diff --git a/tox.ini b/tox.ini
index f80dd68f07d608a431b9f878a350909fb9543721..3274b287e4426d71d00b6f4247081cc639181464 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,7 @@ whitelist_externals = sh
                       find
                       rm
 commands =
-  find . -type f -name "*.pyc" -delete
+  find . -type f -name "*.py[c|o]" -delete
   sh tools/pretty_tox.sh '{posargs}'
 passenv = http_proxy
           HTTP_PROXY