diff --git a/.travis.yml b/.travis.yml
index 62be26f..0b24271 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,10 +3,17 @@ language: php
 php:
   - 5.3
   - 5.6
-  - hhvm
+
+# also test against HHVM, but require "trusty" and ignore errors
+matrix:
+  include:
+    - php: hhvm
+      dist: trusty
+  allow_failures:
+    - php: hhvm
 
 install:
-  - composer install --prefer-source --no-interaction
+  - composer install --no-interaction
 
 script:
   - vendor/bin/phpunit --coverage-text