diff --git a/.travis.yml b/.travis.yml
index fce76a041..7bd1b87be 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,9 +3,11 @@ language: rust
 rust:
   - nightly
 
+cache: cargo
+
 before_script:
-  - (cargo install mdbook --version =0.1.7)
+  - (cargo install mdbook --version =0.1.7 || true)
 
-script: 
+script:
   - export PATH=$PATH:/home/travis/.cargo/bin && mdbook test
   - cd stable-check && cargo run -- ../src