diff --git a/.bundlewatch.config.json b/.bundlewatch.config.json
index 65b6ca409..e86ccd828 100644
--- a/.bundlewatch.config.json
+++ b/.bundlewatch.config.json
@@ -9,5 +9,9 @@
             "maxSize": "30KB"
         }
     ],
-    "defaultCompression": "gzip"
+    "defaultCompression": "gzip",
+    "ci": {
+        "repoBranchBase": "2.x",
+        "trackBranches": ["2.x"]
+    }
 }
diff --git a/.github/workflows/REUSABLE_frontend.yml b/.github/workflows/REUSABLE_frontend.yml
index 705eeb357..b124b88a0 100644
--- a/.github/workflows/REUSABLE_frontend.yml
+++ b/.github/workflows/REUSABLE_frontend.yml
@@ -152,3 +152,4 @@ jobs:
         env:
           BUNDLEWATCH_GITHUB_TOKEN: ${{ secrets.bundlewatch_github_token }}
           CI_COMMIT_SHA: ${{ github.event.pull_request.head.sha }}
+          CI_BRANCH_BASE: ${{ github.event.pull_request.base.ref }}