diff --git a/.travis.yml b/.travis.yml
index c996029..760e126 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,6 +19,7 @@ addons:
     packages:
     - ccache
     - cmake
+    - g++-4.9
 
 before_install:
   - if [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then brew update; fi