diff --git a/.github/workflows/generate_formulae.brew.sh_data.yml b/.github/workflows/generate_formulae.brew.sh_data.yml
index 5ea160c3fd..663c4a5bd2 100644
--- a/.github/workflows/generate_formulae.brew.sh_data.yml
+++ b/.github/workflows/generate_formulae.brew.sh_data.yml
@@ -7,6 +7,7 @@ on:
 
 jobs:
   generate:
+    if: github.repository == 'Homebrew/homebrew-core'
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@master