diff --git a/.travis.yml b/.travis.yml
index 38857685..4b1160b0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,7 @@ notifications:
 before_install:
 - npm i -g npm@^2.0.0
 before_script:
+- npm prune
 - curl -Lo travis_after_all.py https://raw.github.com/dmakhno/travis_after_all/master/travis_after_all.py
 after_success:
 - python travis_after_all.py