diff --git a/.travis.yml b/.travis.yml
index 207affe..d6fe7d0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,11 @@
 language: ruby
 sudo: false
-script: "bundle exec jekyll build"
+script: "set -e && bundle exec jekyll build && bundle exec htmlproof ./_site"
+rvm: 2.1
 notifications:
     email: false
 matrix:
     fast_finish: true
+env:
+  global:
+  - NOKOGIRI_USE_SYSTEM_LIBRARIES=true # speeds up installation of html-proofer