diff --git a/.github/workflows/require-additional-reviewer.yml b/.github/workflows/require-additional-reviewer.yml
index ea46ee9..f020dd5 100644
--- a/.github/workflows/require-additional-reviewer.yml
+++ b/.github/workflows/require-additional-reviewer.yml
@@ -15,6 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
         with:
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           # If the base branch has been merged into the release branch, we
           # need to find the earliest common ancestor commit of the base and
           # release branches.