diff --git a/.forgejo/workflows/build.yaml b/.forgejo/workflows/build.yaml
index 13c6683..3a6fde8 100644
--- a/.forgejo/workflows/build.yaml
+++ b/.forgejo/workflows/build.yaml
@@ -18,8 +18,8 @@ jobs:
         id: check
         uses: https://github.com/ClementTsang/docker-check-base-image-diff@v0.0.2
         with:
-          base-image: codeberg.org/forgejo/forgejo:${{ env.FORGEJO_VERSION }}
-          derived-image: ${{ env.REPO }}:latest
+          base-image: docker://codeberg.org/forgejo/forgejo:${{ env.FORGEJO_VERSION }}
+          derived-image: docker://${{ env.REPO }}:latest
       - name: Check result
         if: env.SCHEDULED
         run: echo "Needs updating = ${{ steps.check.outputs.differs }}"