diff --git a/.github/workflows/sync.yml b/.github/workflows/sync.yml
index 74016d0f..9c7b7e6f 100644
--- a/.github/workflows/sync.yml
+++ b/.github/workflows/sync.yml
@@ -9,6 +9,7 @@ jobs:
   sync_latest_from_upstream:
     name: Sync latest commits from upstream repo
     runs-on: ubuntu-latest
+    if: ${{ github.event.repository.fork }}
 
     steps:
       # Step 1: run a standard checkout action, provided by github