diff --git a/.github/workflows/mirror.yml b/.github/workflows/mirror.yml
index 80abf2c000b885a60475f8f364453db0a8e4a3d5..4fb803a0457ab4f77046008581b3be38ba89603b 100644
--- a/.github/workflows/mirror.yml
+++ b/.github/workflows/mirror.yml
@@ -5,6 +5,7 @@ on: [push, delete]
 jobs:
   to_gitlab:
     runs-on: ubuntu-latest
+    if: github.repository_owner == 'Concordant'
     steps:
       - uses: actions/checkout@v2
         with: