diff --git a/tox.ini b/tox.ini
index 320b1e4..a1b7138 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,6 +37,8 @@
     pyasn1
     ndg-httpsclient
 passenv = ARCHFLAGS CFLAGS LC_ALL LDFLAGS PATH LD_LIBRARY_PATH TERM
+whitelist_externals =
+    rm
 commands =
     python -c "import OpenSSL.SSL; print(OpenSSL.SSL.SSLeay_version(OpenSSL.SSL.SSLEAY_VERSION))"
     python -c "import cryptography; print(cryptography.__version__)"