diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index c36bd28..504c408 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -82,7 +82,7 @@ jobs:
       - name: Save Docker image
         run: |
           mkdir -p ./docker-image
-          IMAGE=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+          IMAGE=${{ env.REGISTRY }}/$(echo "${{ env.IMAGE_NAME }}" | tr '[:upper:]' '[:lower:]'):latest
           docker save $IMAGE -o ./docker-image/image.tar
 
       - name: Upload Docker image