diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
index a069462..8f8026e 100644
--- a/.github/workflows/security.yml
+++ b/.github/workflows/security.yml
@@ -48,7 +48,7 @@ jobs:
         uses: trufflesecurity/trufflehog@v3.95.5
         with:
           path: ./
-          base: ${{ github.event_name == 'push' && github.event.before || github.event.repository.default_branch }}
+          base: ${{ github.event_name == 'pull_request' && github.event.repository.default_branch || '' }}
           head: HEAD
           extra_args: --only-verified