diff --git a/.travis.yml b/.travis.yml
index ed5b51976..76054da85 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,6 +51,7 @@ matrix:
         - LLVM_ARCHIVE_PATH=$HOME/clang+llvm.tar.xz
         - COMPILER=$HOME/clang-$LLVM_VERSION/bin/clang++
         - CPPFLAGS="-I $HOME/clang-$LLVM_VERSION/include/c++/v1"
+        - CXXFLAGS=-lc++
       before_install:
        - wget http://llvm.org/releases/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-14.04.tar.xz -O $LLVM_ARCHIVE_PATH
        - mkdir $HOME/clang-$LLVM_VERSION