diff --git a/travis-python-setup.sh b/travis-python-setup.sh
index c465aa28a..a78252f27 100755
--- a/travis-python-setup.sh
+++ b/travis-python-setup.sh
@@ -1,4 +1,4 @@
-add-apt-repository ppa:fkrull/deadsnakes
+add-apt-repository -y ppa:fkrull/deadsnakes
 apt-get update
 apt-get install python2.6 python2.6-dev python3.3 python3.3-dev pypy pypy-dev
 pip install tox