diff --git a/.travis.yml b/.travis.yml
index adbf643c2..36dd3cd1e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ php:
   - 5.3
   - 5.4
   - 5.5
+  - hhvm
 
 env:
   - DB=mysql
@@ -22,3 +23,7 @@ script: phpunit --configuration tests/travis/$DB.travis.xml
 
 after_script:
   - php vendor/bin/coveralls -v
+
+matrix:
+  allowed_failures:
+    - php: hhvm