diff --git a/.drone.yml b/.drone.yml
index 1c0d902..347c5a2 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -8,9 +8,7 @@ steps:
   commands:
   - yarn
   - yarn test
-  when:
-    branch:
-    - $DRONE_SOURCE_BRANCH
+  source: ${DRONE_SOURCE_BRANCH}
 trigger:
   event:
   - pull_request
\ No newline at end of file