diff --git a/.travis.yml b/.travis.yml
index 5796deca..2c4b6e5f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ php:
   - 5.3
   - 5.4
   - 5.5
+  - hhvm
 
 before_script:
   ## Composer