diff --git a/.gitea/workflows/build-and-publish.yaml b/.gitea/workflows/build-and-publish.yaml
index 93593d6..4d52144 100644
--- a/.gitea/workflows/build-and-publish.yaml
+++ b/.gitea/workflows/build-and-publish.yaml
@@ -13,7 +13,7 @@ jobs:
         uses: actions/checkout@v4
       - name: build image
         run: |
-          export SHORT_SHA=${GITEA_SHA::7}
+          export SHORT_SHA=$GITEA_SHA::7
           docker buildx build --platform linux/amd64 \
           -t git.gractwo.pl/gractwo/arche:latest \
           -t git.gractwo.pl/gractwo/arche:$SHORT_SHA \