diff --git a/.travis.yml b/.travis.yml
index d00185a..fb6e25f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,3 +4,5 @@ node_js:
 before_script:
   - "npm install -g grunt-cli"
   - "npm install"
+  - "sudo apt-get update --quiet=2"
+  - "sudo apt-get --quiet=2 install perceptualdiff"
diff --git a/Gruntfile.js b/Gruntfile.js
index 1f6a50a..046b67d 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -63,6 +63,7 @@ module.exports = function (grunt) {
         command: './run.sh',
         options: {
           stdout: true,
+          failOnError: true,
           execOptions: {
             cwd: 'spec/viz'
           }