diff --git a/.github/workflows/run-verification.yml b/.github/workflows/run-verification.yml
index 80dbe41..cca2ad6 100644
--- a/.github/workflows/run-verification.yml
+++ b/.github/workflows/run-verification.yml
@@ -31,7 +31,7 @@ jobs:
 
       - name: Set up environment variables
         run: |
-          echo "PR_BRANCH=${{ github.head_ref }}" >> $GITHUB_ENV
+          echo "PR_BRANCH=${{ github.event.pull_request.base.ref }}" >> $GITHUB_ENV
           echo "BASE_BRANCH=${{ github.base_ref }}" >> $GITHUB_ENV
 
       - name: Fetch branches