diff --git a/.github/workflows/image.yml b/.github/workflows/image.yml
index c10ce5f..64588b7 100644
--- a/.github/workflows/image.yml
+++ b/.github/workflows/image.yml
@@ -18,6 +18,7 @@ jobs:
       run: docker image build -f Containerfile --tag ghcr.io/vanilla-os/differ:main .
 
     - name: Publish image
+      if: github.repository == 'vanilla-os/differ' && github.ref == 'refs/heads/main'
       run: |
         docker login ghcr.io -u ${{ env.REGISTRY_USER }} -p ${{ env.REGISTRY_PASSWORD }}
         docker image push "ghcr.io/vanilla-os/differ:main"