diff --git a/.drone.yml b/.drone.yml
index cb61724..ff9bf04 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -20,7 +20,7 @@ steps:
     image: 'python:3-alpine'
     commands:
       - apk update > /dev/null && apk add git > /dev/null
-      - 'git --no-pager diff --name-only ${DRONE_SOURCE_BRANCH}..HEAD'
+      - 'git --no-pager diff --name-only ${DRONE_COMMIT_REF}..HEAD'
       #- python -m venv .venv
       #- source ./.venv/bin/activate
       #- 'pip install pylama pylama\[all\] > /dev/null'