diff --git a/.drone.yml b/.drone.yml
index 21a2dfa..ab6c0c6 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -151,13 +151,12 @@ steps:
       - name: cache
         path: /cache
     commands:
-      - shopt -s extglob
       - mkdir -p /tmp/pages/docs
       - cp -r ./docs/book/* /tmp/pages/docs
       - mkdir -p /tmp/pages/docs/_api/backend
       - cp -r ./docker/backend/docs/* /tmp/pages/docs/_api/backend
       - ls -a
-      - rm -rf !(".git")
+      - find . ! -name ".git" -delete
       - cp -r /tmp/pages/* .
       - ls -a
       - ls -a ./docs