diff --git a/.travis.yml b/.travis.yml
index 02b4d16a2e..8002ad0283 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ php:
   - 5.3
   - 5.2
   - hhvm
+  - nightly
 
 script: cd ./tools/ && set -e && make test