diff --git a/.travis.yml b/.travis.yml
index f7f035f..2818a5f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,10 @@ language: ruby
 
 cache:
   bundler: true
+  # Cache nanoc directories
+  directories:
+    - output
+    - tmp
 
 rvm:
 - 2.3.1