diff --git a/.travis.yml b/.travis.yml
index d4f853f9c..94826b96f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,7 +27,7 @@ addons:
 before_install:
   # native dependencies
   - if [ $TRAVIS_OS_NAME == "linux" ]; then
-      sudo apt-add-repository ppa:snappy-dev/tools;
+      sudo apt-add-repository -y ppa:snappy-dev/tools;
       sudo apt-get update -qq;
       sudo apt-get install -qq libxml2-dev;
       sudo apt-get install -qq libappindicator1;