diff --git a/.github/workflows/repo-lockdown.yml b/.github/workflows/repo-lockdown.yml
--- a/.github/workflows/repo-lockdown.yml
+++ b/.github/workflows/repo-lockdown.yml
@@ -9,6 +9,7 @@
 jobs:
   action:
     runs-on: ubuntu-latest
+    if: github.repository == 'llvm/llvm-project'
     steps:
       - uses: dessant/repo-lockdown@v2
         with: