diff --git a/.travis.yml b/.travis.yml
index 787a9e4..232ee39 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,8 +19,8 @@ addons:
 install:
  - if [ "$CXX" = "g++" ]; then export CXX="ccache g++-5" CC="ccache gcc-5"; fi
  - if [ "$CXX" = "clang++" ]; then export CXX="ccache clang++-3.7" CC="ccache clang-3.7"; fi
- - curl https://cmake.org/files/v3.4/cmake-3.4.0-Linux-x86_64.tar.gz | tar -xzvf -
- - curl http://www.llvm.org/releases/3.7.0/llvm-3.7.0.src.tar.xz | tar -xzvf -
+ - curl https://cmake.org/files/v3.4/cmake-3.4.0-Linux-x86_64.tar.gz | tar -xzf -
+ - curl http://www.llvm.org/releases/3.7.0/llvm-3.7.0.src.tar.xz | tar -xJf -
  - mkdir $TRAVIS_BUILD_DIR/llvm-3.7.0.src/build
  - cd $TRAVIS_BUILD_DIR/llvm-3.7.0.src/build && $TRAVIS_BUILD_DIR/cmake-3.4.0-Linux-x86_64/bin/cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/tmp/LLVM37 -DLLVM_TARGETS_TO_BUILD="X86" ..
  - cd $TRAVIS_BUILD_DIR/llvm-3.7.0.src/build && make install