diff --git a/.drone.yml b/.drone.yml
index b178799..2528de9 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -8,6 +8,7 @@ steps:
   - name: check style
     image: python:3.12-alpine
     commands:
+      - apk add --no-cache git  # required by isort to skip files in .gitignore
       - pip install black isort
       - black --check .
       - isort -c .