diff --git a/.github/workflows/hide-old-bot-comments.yml b/.github/workflows/hide-old-bot-comments.yml
index 0efa3ad..6f9360f 100644
--- a/.github/workflows/hide-old-bot-comments.yml
+++ b/.github/workflows/hide-old-bot-comments.yml
@@ -7,6 +7,7 @@ on: pull_request
 jobs:
   hide-old-bot-comments:
     runs-on: ubuntu-latest
+    if: github.event.pull_request.head.repo.fork == false
     steps:
       - name: Hide old bot comments
         uses: kamatama41/hide-pr-comments-action@v0