diff --git a/.github/workflows/docker-publish.yml b/.github/workflows/docker-publish.yml
index d6e71a5..0b525c0 100644
--- a/.github/workflows/docker-publish.yml
+++ b/.github/workflows/docker-publish.yml
@@ -49,7 +49,7 @@ jobs:
           --builder heroku/builder-classic:22 \
           --descriptor project.toml \
           --workspace /app \
-          --env COMPOSER_AUTH=$COMPOSER_AUTH
+          --env COMPOSER_AUTH=$COMPOSER_AUTH \
           --env ALLOW_EOL_SHIMMED_BUILDER=1;
     - name: Tag Docker image to ref
       run: |