diff --git a/.travis.yml b/.travis.yml
index 77bc502de..2b75fc436 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,7 +34,7 @@ matrix:
       compiler: clang
       addons:
         apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.6']
+          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
           packages: ['clang-3.6', 'valgrind']
       env: COMPILER=clang++-3.6
 
@@ -42,7 +42,7 @@ matrix:
       compiler: clang
       addons:
         apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.7']
+          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.7']
           packages: ['clang-3.7', 'valgrind']
       env: COMPILER=clang++-3.7