diff --git a/.github/workflows/build_iso.yml b/.github/workflows/build_iso.yml
index 990de53..4c89f38 100644
--- a/.github/workflows/build_iso.yml
+++ b/.github/workflows/build_iso.yml
@@ -107,6 +107,7 @@ jobs:
           arch: ${{ needs.load_vars.outputs.ARCH }}
           image_name: ${{ matrix.image_name }}
           image_repo: ${{ matrix.image_repo}}
+          image_src: ${{ matrix.image_src }}
           image_tag: ${{ matrix.version }}
           version: ${{ matrix.version }}
           repos: ${{ matrix.repos }}
@@ -118,6 +119,7 @@ jobs:
           iso_name: build/${{ matrix.image_name }}-${{ matrix.version }}${{ matrix.flatpaks == 'false' && '' || format('-{0}', matrix.flatpaks) }}.iso
 
       - name: Upload ISO as artifact
+        if: matrix.version != 'fake'
         id: upload
         uses: actions/upload-artifact@v4
         with:
diff --git a/.github/workflows/build_vars.yml b/.github/workflows/build_vars.yml
index 1f9cf95..6806eaa 100644
--- a/.github/workflows/build_vars.yml
+++ b/.github/workflows/build_vars.yml
@@ -37,6 +37,12 @@ on:
                 "version": "40",
                 "image_repo": "quay.io/fedora",
                 "image_name": "fedora-bootc"
+              },
+              {
+                "version": "fake",
+                "image_repo": "quay.io/fedora",
+                "image_name": "fedora-bootc",
+                "image_src": "docker://quay.io/fedora-ostree-desktops/base:39"
               }
             ]
           }'
diff --git a/container/Makefile b/container/Makefile
index c9f7c4a..9e662dc 100644
--- a/container/Makefile
+++ b/container/Makefile
@@ -1,9 +1,5 @@
-ifeq ($(IMAGE_SRC),)
-IMAGE_SRC := docker://$(IMAGE_REPO)/$(IMAGE_NAME):$(IMAGE_TAG)
-endif
-
 $(IMAGE_NAME)-$(IMAGE_TAG):
-	skopeo copy $(IMAGE_SRC) oci:$(IMAGE_NAME)-$(IMAGE_TAG)
+	skopeo copy $(if $(IMAGE_SRC),$(IMAGE_SRC),docker://$(IMAGE_REPO)/$(IMAGE_NAME):$(IMAGE_TAG)) oci:$(IMAGE_NAME)-$(IMAGE_TAG)
 
 install-deps:
 	$(install_pkg) skopeo