diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 006a489ed..4dc16f485 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -35,7 +35,7 @@ jobs:
       - name: Lint Check
         run: npm run lint
         env:
-          ESLINT_PLUGIN_DIFF_COMMIT: ${{ github.event.pull_request.base.ref }}
+          ESLINT_PLUGIN_DIFF_COMMIT: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref || 'main' }}
 
       # tests
       - name: Test Package bruno-js