diff --git a/.drone.yml b/.drone.yml
index 264f00d..d4acabb 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -7,7 +7,7 @@ steps:
   - name: build docker image
     image: plugins/docker
     environment:
-      DOCKER_BUILDKIT=1
+      DOCKER_BUILDKIT="1"
     settings:
       purge: true
       autotag: true