diff --git a/.travis.yml b/.travis.yml
index 9ffc80cb..54b96f54 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ before_install:
   - composer self-update
 
 install:
-  - composer install --prefer-source
+  - composer install
 
 script:
   - phpunit -v --coverage-text