diff --git a/.travis.yml b/.travis.yml
index 556ce2ebe..82627ac49 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,5 +26,8 @@ after_script:
   - php vendor/bin/coveralls -v
 
 matrix:
+  exclude:
+    - php: hhvm
+      env: DB=pgsql  # driver for PostgreSQL currently unsupported by HHVM, requires 3rd party dependency
   allow_failures:
     - php: 7.0