diff --git a/.travis.yml b/.travis.yml
index b1deec7..2f7e8c8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,10 +6,13 @@ php:
   - 5.5
   - 5.6
   - 7.0
+  - hhvm
+  - hhvm-nightly
 
 matrix:
   allowed_failures:
     - php: 7.0
+    - php: hhvm-nightly
 
 before_script:
   - composer install --no-interaction --prefer-source