diff --git a/.travis.yml b/.travis.yml
index 32bb75b..f66e768 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ before_install:
 
 before_script:
   - travis_retry composer self-update
-  - travis_retry composer install --no-interaction --prefer-source
+  - travis_retry composer install --no-interaction --prefer-dist
   - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then printf "\n" | pecl install uuid; fi;'
   - phpenv rehash