diff --git a/.travis.yml b/.travis.yml
index aceb921..5b8df6b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,7 @@ language: R
 cache:
   packages: true
   directories:
-  - *_cache
-  - *_files
+  - _book
 
 addons:
   apt: