diff --git a/.travis.yml b/.travis.yml
index 9f7c4a14..be74f111 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,11 @@
 language: java
+os: linux
+addons:
+  apt:
+    sources:
+      - llvm-toolchain-trusty-6.0
+    packages:
+      - clang-6.0
 
 env:
   - TARGET: website