diff --git a/tox.ini b/tox.ini
index cecc1fb1..c2c0e693 100644
--- a/tox.ini
+++ b/tox.ini
@@ -39,6 +39,7 @@ commands =
     rm -rf doc/html doc/build
     rm -rf doc/source/apidoc doc/source/api
     sphinx-build -W -b html doc/source doc/build/html
+whitelist_externals = rm
 
 [testenv:cover]
 basepython = python3