diff --git a/.github/workflows/bot-pr-updated.yml b/.github/workflows/bot-pr-updated.yml
index d9fc4a13b79..9c7c73c9414 100644
--- a/.github/workflows/bot-pr-updated.yml
+++ b/.github/workflows/bot-pr-updated.yml
@@ -37,7 +37,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           path: old
-          ref: develop
+          ref: ${{ github.event.pull_request.base.ref }}
       - name: Install abidiff
         run: sudo apt-get install abigail-tools
       - name: Build both libraries