diff --git a/.drone.yml b/.drone.yml
index 90bf399..29aa1cf 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -20,7 +20,8 @@ steps:
         path: /var/run/docker.sock
     commands:
       - echo $PASSWORD | docker login docker.grassecon.net --username ci --password-stdin
-      - TAG=$(git describe --tags $(git rev-list --tags --max-count=1)) docker-compose -f docker-compose.build.yml build --progress plain
+      - export TAG=$(git describe --tags $(git rev-list --tags --max-count=1))
+      - docker-compose -f docker-compose.build.yml build --progress plain
       - docker-compose -f docker-compose.build.yml push
 volumes:
   - name: docker_sock