diff --git a/.travis.yml b/.travis.yml
index 2ba8308f0ad5988a23de14cbc913ef44f40dfbc4..2743ba268a243238a99086e01829307c5dc37d4c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -39,7 +39,7 @@ before_install:
 before_script:
   # First build external lib
   - ./ci/build_openssl.sh
-  - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install libev; fi
+  - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install libev cunit; fi
   # configure ngtcp2
   - if [ "$CI_BUILD" == "autotools" ]; then autoreconf -i; fi
   - export PKG_CONFIG_PATH=$PWD/../openssl/build/lib/pkgconfig LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath,$PWD/../openssl/build/lib"