diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 0068d2a..a44030f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,6 +10,7 @@ jobs:
   tests:
     name: Tests
     runs-on: ubuntu-latest
+    if: github.event.pull_request.head.repo.full_name == github.repository
 
     steps:
     - name: Check out the repo