diff --git a/.travis.yml b/.travis.yml
index 6df40becc..a998fd3e2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,10 @@ cache:
     - app/assets/images
     - tmp/cache/assets
 
+addons:
+  apt:
+    packages: libidn11-dev
+
 branches:
   only:
     - 'master'