diff --git a/tox.ini b/tox.ini
index 048ba11..67e9f0b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,13 +31,14 @@ envlist =
 # Runs on the "tests" directory by default, or passes the positional
 # arguments from `tox -e py <posargs_1> ... <posargs_n>
 commands =
+    python -c "import nltk; nltk.download('punkt'); nltk.download('stopwords')"
     coverage run -p -m pytest --durations=20 {posargs:tests}
     coverage combine
     coverage xml
 extras =
     # See the [options.extras_require] entry in setup.cfg for "tests"
     tests
-    
+
 [testenv:doctests]
 description = Test that documentation examples run properly
 commands =