diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b1ff450..1c91c67 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,7 +14,7 @@ permissions:
 
 jobs:
   build:
-    if: startsWith(github.head_ref, 'release-please--') || github.event_name == 'workflow_dispatch'
+    if: github.event_name == 'workflow_dispatch' || (startsWith(github.head_ref, 'release-please--') && github.event.pull_request.head.repo.full_name == github.repository)
     runs-on: ubuntu-latest
     steps:
       - uses: actions/create-github-app-token@v3