diff --git a/.github/workflows/firebase-hosting-pull-request.yml b/.github/workflows/firebase-hosting-pull-request.yml
index 2cb84ed..94bc8b3 100644
--- a/.github/workflows/firebase-hosting-pull-request.yml
+++ b/.github/workflows/firebase-hosting-pull-request.yml
@@ -5,6 +5,7 @@ name: Deploy to Firebase Hosting on PR
 'on': pull_request
 jobs:
   build_and_preview:
+    if: '${{ github.event.pull_request.head.repo.full_name == github.repository }}'
     name: Build and Preview
     runs-on: ubuntu-latest
     steps: