diff --git a/.travis.yml b/.travis.yml
index 7de9c9d9..4a8c6b31 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,9 @@ node_js:
   - "node"
 before_script:
   - npm install -g acorn
-script: acorn user.js
+script:
+  - acorn user.js
+  - bash -n cas.sh
 notifications:
   irc:
     channels: