diff --git a/.travis.yml b/.travis.yml
index 17be18c..a575410 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,10 +6,12 @@ php:
   - 5.5
   - 5.6
   - hhvm
+  - hhvm-nightly
  
 matrix:
     allow_failures:
         - php: hhvm
+        - php: hhvm-nightly
 
 script:
  - vendor/bin/phpunit