diff --git a/.travis.yml b/.travis.yml
index 282e594..ad1f366 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,4 +5,5 @@ php:
   - 5.4
 
 before_script:
+  - echo "extension = mongo.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - composer install --dev