diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 067e3c266..fd7be3fdb 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -7,6 +7,7 @@ on:
 jobs:
   build:
     name: Build
+    if: ${{ startsWith(github.repository, 'apache/') }}
     runs-on: ubuntu-20.04
     strategy:
       matrix: