diff --git a/.travis.yml b/.travis.yml
index 1b077e40b5..a3fb89fba6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: php
 
 before_script:
-  - sudo apt-get install php5-memcache
+  - sudo apt-get install -y php5-memcache
   - ./test/bin/run_elasticsearch.sh
 
 script: phpunit -c test/