diff --git a/.github/workflows/mirror.yml b/.github/workflows/mirror.yml
index 91cbebd4..79f00456 100644
--- a/.github/workflows/mirror.yml
+++ b/.github/workflows/mirror.yml
@@ -5,6 +5,7 @@ on: [push, delete]
 jobs:
   to_codeberg:
     runs-on: ubuntu-latest
+    if: ${{ github.ref_name == 'master' && !github.event.pull_request }}
     steps:
       - uses: actions/checkout@v2
         with: