diff --git a/.github/workflows/stockfish.yml b/.github/workflows/stockfish.yml
index ca52ffe0..99c4259a 100644
--- a/.github/workflows/stockfish.yml
+++ b/.github/workflows/stockfish.yml
@@ -13,6 +13,7 @@ on:
       - tools
 jobs:
   Prerelease:
+    if: github.ref == 'refs/heads/master'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3