diff --git a/.travis.yml b/.travis.yml
index d970d1b..ad4eda1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,7 +19,7 @@ matrix:
           os: osx
 sudo: false
 before_install:
-    - sudo add-apt-repository ppa:longsleep/golang-backports
+    - sudo add-apt-repository -y ppa:longsleep/golang-backports
     - sudo apt-get update
     - sudo apt-get install golang-go
 before_script: