diff --git a/.drone.yml b/.drone.yml
index 093dca2..7a8c9fc 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -22,7 +22,7 @@ steps:
 - name: run tests
   image: chialab/php
   environment:
-  - "URL=testserver:8080"
+    - "URL=testserver:8080"
   commands:
   - sleep 10
   - vendor/bin/phpunit tests