diff --git a/.github/workflows/bundle-impact.yml b/.github/workflows/bundle-impact.yml
index 3f2bd5a9..eb00b495 100644
--- a/.github/workflows/bundle-impact.yml
+++ b/.github/workflows/bundle-impact.yml
@@ -21,6 +21,8 @@ jobs:
       - run: pnpm install
       - name: Run Bundle Impact
         uses: actions/github-script@v7
+        env:
+          TARGET_BRANCH: ${{ github.base_ref }}
         with:
           github-token: ${{secrets.GITHUB_TOKEN}}
           script: |