diff --git a/.travis.yml b/.travis.yml
index be1455df..4e0eb52c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,5 @@
 language: ruby
 rvm:
   - "2.1.2"
+before_install:
+  - sudo apt-get install -qq pdftk