diff --git a/.travis.yml b/.travis.yml
index ea7c1c8..96ac55f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,11 @@ matrix:
     - os: linux
       php: '7.0'
 
+    - os: linux
+      php: hhvm
+      env:
+        - HHVMPHP7="yes"
+
     - os: osx
       osx_image: xcode7.3
       language: generic