diff --git a/.github/workflows/core.yml b/.github/workflows/core.yml
index 99fa57472d..92b14e5fab 100644
--- a/.github/workflows/core.yml
+++ b/.github/workflows/core.yml
@@ -697,7 +697,7 @@ jobs:
 
   core_ui_comment:
     name: Post comment with UI diff URLs
-    if: github.event_name == 'pull_request'
+    if: github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository
     runs-on: ubuntu-latest
     needs:
       - param