diff --git a/.travis.yml b/.travis.yml
index b834abe..2c6b59a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,6 +33,7 @@ matrix:
 
 before_install:
   - if [[ -z $TEST_VERSION && -f "/home/travis/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini" ]]; then phpenv config-rm xdebug.ini; fi
+  - echo "extension = mongodb.so" >> /home/travis/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - composer global require hirak/prestissimo
   - composer self-update --stable --no-progress