diff --git a/.travis.yml b/.travis.yml
index 906d6e9..808bbcf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -88,7 +88,7 @@ install:
       (cd llvm/build && cmake .. -DCMAKE_INSTALL_PREFIX=${TRAVIS_BUILD_DIR}/llvm/install)
       (cd llvm/build/projects/libcxx && make install -j2)
       (cd llvm/build/projects/libcxxabi && make install -j2)
-      export STD_CXX_FLAGS="-isystem ${TRAVIS_BUILD_DIR}/llvm/install/include/c++/v1"
+      export STD_CXX_FLAGS="-isystem ${TRAVIS_BUILD_DIR}/llvm/install/include/c++/v1 -stdlib=libc++"
       export STD_LINKER_FLAGS="-L ${TRAVIS_BUILD_DIR}/llvm/install/lib -l c++ -l c++abi"
       export STD_LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:${TRAVIS_BUILD_DIR}/llvm/install/lib"
     fi