diff --git a/tox.ini b/tox.ini
index 2093ce737..6f94060cf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,6 +16,7 @@ commands =
     coverage erase
     python setup.py testr --coverage --testr-args='{posargs}'
     coverage report -m
+whitelist_externals = rm
 
 [testenv:cover]
 deps =