diff --git a/.travis.yml b/.travis.yml
index 2c82347..aeb269b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,13 @@ php:
   - 5.4
   - 5.5
   - 5.6
+  - hhvm
+  - hhvm-nightly
+
+matrix:
+  allow_failures:
+    - php: hhvm
+    - php: hhvm-nightly
 
 before_install:
   - composer self-update