diff --git a/.travis.yml b/.travis.yml
index 0f00bbe9..017917dd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,7 @@ matrix:
           - llvm-toolchain-trusty-6.0
           packages:
           - clang-6.0
+          - g++-7
       env:
       - MATRIX_EVAL="CC=clang-6.0 && CXX=clang++-6.0"