diff --git a/tox.ini b/tox.ini
index e02a09ed54..9871a879c4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,7 @@ install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstac
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
-  find {toxinidir} -not -path '{toxinidir}/.tox/*' -name '*.pyc' -delete
+  find {toxinidir} -not -path '{toxinidir}/.tox/*' -name '*.py[c|o]' -delete
   python setup.py testr --slowest --testr-args='{posargs}'
 
 whitelist_externals =
@@ -22,7 +22,7 @@ passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:py27log]
 commands =
-  find . -type f -name "*.pyc" -delete
+  find . -type f -name "*.py[c|o]" -delete
   bash tools/pretty_tox.sh '^(?!heat_integrationtests){posargs}'
 
 [testenv:pep8]