diff --git a/.travis.yml b/.travis.yml
index 2c7bef4..611c0ea 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,4 +11,5 @@ matrix:
     - php: hhvm
 
 before_script:
+  - phpenv config-add tests/config.ini
   - composer install --dev --prefer-source
diff --git a/tests/config.ini b/tests/config.ini
new file mode 100644
index 0000000..be28dd1
--- /dev/null
+++ b/tests/config.ini
@@ -0,0 +1,2 @@
+session.serialize_handler = php
+