diff --git a/.travis.yml b/.travis.yml
index 34b65e54..c428bdb4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,7 @@ addons:
   apt:
     sources:
     - ubuntu-toolchain-r-test
+    - llvm-toolchain-precise
     packages:
     - g++-4.8
     - g++-4.9