diff --git a/.travis.yml b/.travis.yml
index ab910a2..8652f5f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,11 +13,13 @@ matrix:
     - php: 7.1
     - php: 7.2
     - php: hhvm
+      env: HHVM=true
 
 install:
   - composer install
 
 before_script:
+  - if [[ $HHVM && ${HHVM-x} ]] && curl -sSf -o ~/.phpenv/versions/hhvm/bin/phpunit https://phar.phpunit.de/phpunit-5.7.phar
   - mkdir -p build/logs
   - cd tests