diff --git a/.travis.yml b/.travis.yml
index fbbbc72..2ac373e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,3 +14,9 @@ php:
   - 5.5
   - 5.6
   - hhvm
+  - hhvm-nightly
+
+matrix:
+  allow_failures:
+    - php: hhvm-nightly
+  fast_finish: true