diff --git a/.travis.yml b/.travis.yml
index 945e1738..c9745dca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,7 +32,7 @@ script:
   - sudo ee stack install --web
   - sudo ee stack install --admin
 
-  - yes | sudo ee stack install --nginxmainline
+  - echo "yes" | sudo ee stack install --nginxmainline
 
   - sudo ee site create html.net --html
   - sudo ee site create php.com --php