diff --git a/tox.ini b/tox.ini
index f28e277..8328bc5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -32,6 +32,7 @@ basepython =
 extras=
     test
     doctest: doc
+whitelest_externals=make
 
 [testenv:lint]
 extras=lint