diff --git a/.travis.yml b/.travis.yml
index 3cc39a58..c1fb0b36 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,7 +10,8 @@ matrix:
    - php: 5.3
      dist: precise
    - php: 5.4
-   - php: 5.5
+      dist: precise
+  - php: 5.5
    - php: 5.6
    - php: 7.0
    - php: 7.1