diff --git a/.github/workflows/bundlewatch.yml b/.github/workflows/bundlewatch.yml
index 305d17ae59..f09cc9667d 100644
--- a/.github/workflows/bundlewatch.yml
+++ b/.github/workflows/bundlewatch.yml
@@ -36,3 +36,4 @@ jobs:
         run: npm run bundlewatch
         env:
           BUNDLEWATCH_GITHUB_TOKEN: "${{ secrets.BUNDLEWATCH_GITHUB_TOKEN }}"
+          CI_BRANCH_BASE: main