diff --git a/.github/workflows/site.yml b/.github/workflows/site.yml
index 983611e..d559e91 100644
--- a/.github/workflows/site.yml
+++ b/.github/workflows/site.yml
@@ -20,6 +20,7 @@ concurrency:
 
 jobs:
   build:
+    if: github.repository_owner == 'jenkinsci'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout