diff --git a/.travis.yml b/.travis.yml
index a3e3ff11a6b6841376a6077e688f9c98d60c5f8d..e9a03c09e23dccb0350dc6e2925e40a5c8196a6a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -49,7 +49,8 @@ mysql:
 before_install:
   - phpenv config-rm xdebug.ini
   - phpenv rehash
-  - if [[ ! -f $HOME/.composer/auth.json ]]; then rm $HOME/.composer/auth.json fi
+  - COMPOSER_AUTH_PATH="$HOME/.composer/auth.json"
+  - if [[ -f COMPOSER_AUTH_PATH ]]; then rm $HOME/.composer/auth.json fi
   - composer self-update
   - composer --version