diff --git a/.travis.yml b/.travis.yml
index 0e8866e..2e1858c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,6 @@
 language: shell
+before_install:
+  - sudo apt-get install zsh
 script: ./test/run.sh
 notifications:
   email: 8slashes+travis-ci@gmail.com