diff --git a/.travis.yml b/.travis.yml
index baa33dce0..fd72647f0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ sudo: required
 addons:
   apt:
     sources:
-      - docker-xenial
+    - docker-xenial
     packages:
     - docker