diff --git a/.travis.yml b/.travis.yml
index ec5d856e..ca8751b5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,7 @@ addons:
   apt:
     sources:
     - ubuntu-toolchain-r-test
+    - llvm-toolchain-precise
     - llvm-toolchain-precise-3.6
     - llvm-toolchain-precise-3.7
     packages: