diff --git a/.forgejo/workflows/build.yml b/.forgejo/workflows/build.yml
index 4f9d795..073151d 100644
--- a/.forgejo/workflows/build.yml
+++ b/.forgejo/workflows/build.yml
@@ -38,6 +38,7 @@ jobs:
       - name: Build image (uses host Docker via mounted socket)
         run: |
           docker build \
+            -f Containerfile \
             --build-arg BASE_IMAGE="${{ matrix.base_image }}" \
             --build-arg BASE_TAG=stable \
             -t "${IMAGE}:stable" \