diff --git a/.travis.yml b/.travis.yml
index 0ef0741..bdae16d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,6 +13,7 @@ addons: &addons
     packages: &packages
       - g++-4.9
       - libboost-test-dev
+      - libboost-system-dev
       - libcurl4-openssl-dev
     sources: &sources
       - ubuntu-toolchain-r-test