diff --git a/.github/workflows/mirror.yml b/.github/workflows/mirror.yml
index 5a8fcad5c00d699d31335bde7624f89039bd0a90..c3c6ecc2089f9e2301c59ffecadd4cec3e8c9c99 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: